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Low RPM issue
#12860645
08/11/18 01:20 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Recently purchased a boat with a 2006 Mercury 200 hp, max rpm Im getting is 4900-5000... mph only 52. Boat is 18.8 feet and should be running 62-68... any ideas what the issue could be? Recently had new powerhead installed and full tune up. Thanks
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Re: Low RPM issue
[Re: GROD]
#12860706
08/11/18 02:33 AM
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Joined: Sep 2006
Posts: 12,447
JIM SR.
TFF Guru
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TFF Guru
Joined: Sep 2006
Posts: 12,447 |
I take it back to the ones that did the work,...ask them.
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Re: Low RPM issue
[Re: GROD]
#12860719
08/11/18 02:53 AM
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Joined: Sep 2010
Posts: 2,581
GROD
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Extreme Angler
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OP
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I didnt put the powerhead on, I just purchased he boat from Atlanta and drove it back here. Has A 25p fury prop. I am emailing the place the guy said the new powerhead was put on to try and get info. Ive got a bad feeling Ive been scammed... and out 18k on boat that really doesnt have a new powerhead on it. I say this based off some other issues Im having with Boat and the seller. So Im trying to narrow down some other possible reasons, so please no more smart remarks. Thanks... something helpful would be appreciated.
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Re: Low RPM issue
[Re: GROD]
#12860770
08/11/18 05:09 AM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,915 |
You need to be specific on what youve got. And new powerheads are easy to spot.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12860824
08/11/18 11:46 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
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2006 champion 188 w/200 HP Mercury Optimax 2006 medel. 25p Fury 3 blade prop. Boat has a 10 inch jack plate. Max throttle its getting 4900-5000 rpm. Running smooth though. Thanks
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Re: Low RPM issue
[Re: GROD]
#12860890
08/11/18 02:01 PM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,915 |
The exact right setup on that rig is a 25 tempest Set close to 3 1/2 prop shaft under pad will run right at 5,700 rpms and 70 mph.
Youre not there. Find a merc tech and spend some money to verify what you were sold. A thousand possible issues could cause your problems but diagnosis over the internet wont get it done.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12860986
08/11/18 04:04 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Joined: Sep 2010
Posts: 2,581 |
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Re: Low RPM issue
[Re: GROD]
#12861084
08/11/18 05:54 PM
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Joined: Jan 2007
Posts: 2,452
UJC
Extreme Angler
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Extreme Angler
Joined: Jan 2007
Posts: 2,452 |
Your PM box is full.
If you're interested in a Tempest Plus 25, I have one that I want to swap for a 23. I realize that is not what you have so I would sell mine and get a 23 somewhere if you're interested.
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Re: Low RPM issue
[Re: GROD]
#12861712
08/12/18 02:22 PM
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Joined: Nov 2007
Posts: 5,515
ssmith
TFF Celebrity
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TFF Celebrity
Joined: Nov 2007
Posts: 5,515 |
when you took it out an tested before the purchase did it run up to the correct rpms an speed ?
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Re: Low RPM issue
[Re: GROD]
#12861921
08/12/18 07:13 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
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OP
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Unfortunately I drove to Atlanta to purchase and did not take it on the lake. Hooked it up to the hose to make sure all worked and so on. I also failed to crawl under boat, and found out the hard way once back in Fort Worth, the seller failed to disclose fiberglass damage that needed repair! This has turned into a expensive nightmare., and a lesson learned. Guy is supposedly a guide in Atlanta Georgia area, but when I look him up I see nothing about guide service. Seller tried telling me I did the damage to the hull (was on inside of bunker, cant see from the side), which I am 100 percent sure I did not. He got me good, but now Im stuck with it so it has to be fixed. Im in contact with the business owner where he said he got the remanufactured powerhead, hes gonna contact me tomorrow and said he will assist any way he can. I know, Im a [censored].
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Re: Low RPM issue
[Re: GROD]
#12862088
08/12/18 09:50 PM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
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Are you a member on BBC? If not, join and go the the Merc page and check out the hotfoot setup section. Could be possibly part of the problem, not achieving WOT due to not being adjusted properly.
Have you done a compression test? Gauge is cheap and its easy to do, just make sure you do it properly.
And dont feel bad, I got bamboozled too buying a used boat. Its lessons in life that teach us for next time.
Last edited by grout-scout; 08/12/18 09:56 PM.
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Re: Low RPM issue
[Re: GROD]
#12862215
08/12/18 11:29 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Dont beat yourself up on this, its happened to a lot of us, including me. When buying used boats, its sometimes impossible to catch every single issue. I bought my first boat years ago, and the motor ran perfect on the hose and the compression was a perfect 125psi on all holes, thought I had me a decent boat. Next thing I know my number 6 piston shatters to pieces due to a water jacket problem. The seller obviously didnt mention anything about this, and who knows, maybe he didnt know about it either. Anyway, I hope your motor is an easy fix, it does sound like it could be something simple like a throttle cable adjustment. Best of luck to ya.
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Re: Low RPM issue
[Re: GROD]
#12862352
08/13/18 01:47 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Well the fiberglass repair is estimated at 800 to fix, not as bad as I thought... but enough to still [censored] me off. Haha Taking the motor to Ronnie Patterson next week after the fiberglass is repaired. Ive heard nothing but good things about his abilities with Mercury motors. Thank you!
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Re: Low RPM issue
[Re: GROD]
#12862528
08/13/18 11:36 AM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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BIG difference between "new" and "re-manufactured" I sure as hope he didn't have some sleaze like Blackbird do that.
When you took the cowling off did it look clean or did you see orange gasket sealant everywhere?
And by all means you need to out this dude, this is not a large circle we walk in, and nothing I despise more than someone being taken advantage of, especially because of a lack of knowledge.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12863050
08/13/18 06:40 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Sellers name was David Keith Sansbury... out of Atlanta,Ga and previously Satsuma, FL. He says hes a guide, but I cant find anything in relation to him being a guide and says he gets the Power Poles for his new boat at guide discount price. Pissed me off when he tried saying I was a scammer after I had already paid the man 18k. Im a police officer and would never scam anyone, and I should have been more smart about the situation and had it all checked out and crawled under the boat. Was a long drive and I was in a hurry to get back on the road to Texas. We had texted multiple times and I let my gaurd down. Lesson learned for sure!
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Re: Low RPM issue
[Re: GROD]
#12863478
08/14/18 01:24 AM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
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Posts: 16,915 |
Champ family is pretty close. Ive got friends there we can have a friendly chat.
In the meantime you need to get that motor to a merc tech before you run it. Lots of things can blow one up.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12863550
08/14/18 02:11 AM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,915 |
Is your boat red and white? Gotta make sure we're sure about this.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12863758
08/14/18 11:54 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Pat Goff, my dad (Dan Telesko)is on the champion boat owners Facebook as well, he has an older champion. He showed me the discussion and yes it is the same guy and boat. Im curious as to if anyone else went and saw this boat in person from that forum. The seller told me I was the first to look at it. The seller (David Sansbury) texted me this morning about the damage to the hull, and told me to call him at 11:30 bc he may have his insurance fix the damage but would need to be by a reputable rep. (Basically saying he knew it was there, otherwise hed be committing insurance fraud) Boat goes to a mercury mechanic on Monday. Thank you!
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Re: Low RPM issue
[Re: GROD]
#12863783
08/14/18 12:25 PM
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Joined: Jan 2005
Posts: 16,915
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,915 |
Well, I am glad he's responding. Really glad.
Pat Goff Seadrift TX
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Re: Low RPM issue
[Re: GROD]
#12875343
08/24/18 03:20 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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The seller (David Sansbury) contacted me in reference to the hull damage on the bottom of the boat. The boat is currently at classic fiberglass and getting repaired and the seller is doing the right thing and paying to have the hull damage properly repaired. I should get the boat back on the 29th, and Ill then take it to Fun n Sun hurst to have the motor checked out. Thanks for all the assistance.
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Re: Low RPM issue
[Re: GROD]
#12875709
08/24/18 07:46 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Keep us posted on the motor issue, would like to know what the diagnosis is.
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Re: Low RPM issue
[Re: PlanoPaul]
#12878094
08/27/18 04:59 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
Me also Keep us posted on the motor issue, would like to know what the diagnosis is.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Low RPM issue
[Re: GROD]
#12894558
09/10/18 10:03 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Fun n sun checked it out and said the motor was good to go. They said it was a prop issue more than likely, so I purchased a new tempest 23 pitch 3 blade prop... Took it to the lake and same result, Max rpm still 5000 and should be 5500-6000 on this 200hp Mercury per specs. I gained 2 mph with new prop but same rpm issue. Goes back to shop Thursday for them to go through it in detail I guess. Max mph is 55 and should be getting 65-69 easy. Has a 10 inch jack plate and 55 is not Loaded down. Any thoughts are appreciated! Thanks
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Re: Low RPM issue
[Re: GROD]
#12894845
09/11/18 01:26 AM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
I have a thought, but you wont like it; because it could involve saturation of the foam in the hull from the damaged spot. on the motor checkup, I feel like my motor is also having an issue running the full wot. I can change props & pitches and have near the same rpms.
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Re: Low RPM issue
[Re: GROD]
#12894871
09/11/18 01:37 AM
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Joined: Apr 2017
Posts: 12,145
tmd11111
TFF Guru
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TFF Guru
Joined: Apr 2017
Posts: 12,145 |
Fun n sun checked it out and said the motor was good to go. They said it was a prop issue more than likely, so I purchased a new tempest 23 pitch 3 blade prop... Took it to the lake and same result, Max rpm still 5000 and should be 5500-6000 on this 200hp Mercury per specs. I gained 2 mph with new prop but same rpm issue. Goes back to shop Thursday for them to go through it in detail I guess. Max mph is 55 and should be getting 65-69 easy. Has a 10 inch jack plate and 55 is not Loaded down. Any thoughts are appreciated! Thanks Somethings not adding up here. You went out down 2 in pitch, gained 2mph and yet rpms stayed the same? Something I havent seen mentioned in this thread is have you checked the throttle linkage? Is it opening all the way? Also has the tach been checked and are speeds measured by speedo or gps.
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Re: Low RPM issue
[Re: GROD]
#12895162
09/11/18 10:56 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
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Posts: 2,581 |
Yes, fun n sun said its getting full throttle from hot foot and speeds are from gps.
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Re: Low RPM issue
[Re: GROD]
#12895164
09/11/18 10:57 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Boat runs good and idles good, it just wont go over 5k rpm.
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Re: Low RPM issue
[Re: GROD]
#12895216
09/11/18 12:10 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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And damage on bottom of boat was properly repaired by classic fiberglass. Ended up being 2200.
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Re: Low RPM issue
[Re: GROD]
#12895281
09/11/18 01:09 PM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
And damage on bottom of boat was properly repaired by classic fiberglass. Ended up being 2200. Thats good; but how long had it been damaged?
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Re: Low RPM issue
[Re: GROD]
#12895386
09/11/18 02:04 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
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OP
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I dont know, but regardless wouldnt make a difference with rpm issue. Probably going to replace the coil packs... only thing that hasnt been done from my understanding. Ill see what they say this weekend. Thanks
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Re: Low RPM issue
[Re: GROD]
#12895388
09/11/18 02:05 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Posts: 2,581 |
On a side note though, Boat looks much better now! New carpet through out, keel gaurd, and ultrex installed.
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Re: Low RPM issue
[Re: GROD]
#12895703
09/11/18 06:16 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
What do the spark plugs look like? Do you have one that looks different than all the others, signifying that it may not be firing properly? Surely this has already been checked by Fun N Sun. Just hate to see you throw more parts at the problem without any results. Ive heard things about bad batteries or bad connections causing weird issues like this. Just throwing stuff out there.
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Re: Low RPM issue
[Re: GROD]
#12896035
09/11/18 10:20 PM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
I dont know, but regardless wouldnt make a difference with rpm issue. Probably going to replace the coil packs... only thing that hasnt been done from my understanding. Ill see what they say this weekend. Thanks I agree for the most part. Mine has some water in the foam and it causes me some speed loss due to the extra weight. But I also feel like my rpms are stuck, Im hoping you figure out the cause of yours; because I might be in the same situation.
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Re: Low RPM issue
[Re: GROD]
#12896101
09/11/18 11:38 PM
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Joined: Feb 2006
Posts: 909
Alumacraft 14
Pro Angler
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Pro Angler
Joined: Feb 2006
Posts: 909 |
Are you sure the tach is reading right? When you re-propped, did you go up in pitch or down? If you went up, and your motor is pegged at 5k rpm, then you should of seen a rpm loss, like 4800 or 4600rpm. If you went down you should of seen a increase to 5200 or 5400rpm.
It's possible your motor is running with in specs and your tach just won't go beyond 5k.
Tach issues could be a voltage problem, rectifier may be bad...troubleshooting 101, start at the most simple problem and go from there.
Last edited by Alumacraft 14; 09/11/18 11:50 PM.
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Re: Low RPM issue
[Re: GROD]
#12896859
09/12/18 04:21 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Has new plugs, new batteries, and I went down in prop size from a 25 pitch fury to a 23 pitch tempest. Getting same rpm reading of 5k and I gained 2 mph.
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Re: Low RPM issue
[Re: GROD]
#12896860
09/12/18 04:22 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
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Posts: 2,581 |
Taking it in today... I feel like its sometjing to do with the fuel system somewhere, but Boat runs good and idles well.
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Re: Low RPM issue
[Re: GROD]
#12903394
09/18/18 05:39 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Was advised it had some bad fuel injectors... all were replaced... taking her to fork Thursday so we will she how she performs...
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Re: Low RPM issue
[Re: GROD]
#12903486
09/18/18 06:59 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Was wondering about the injectors. Almost sounds like they put the wrong ones in when it was rebuilt(if they were changed during rebuild?)? Or were they just all dirty? Thanks for posting back, let us know how she runs
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Re: Low RPM issue
[Re: GROD]
#12911710
09/25/18 04:05 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Still has the same damn issue of only getting 4900-5000 rpm a max throttle. Motor runs good, but performance is lacking due to an unknown reason. Taking back to fun n sun Thursday. Will keep this thread updated. Ive replaced prop as advised and made no difference in rpm out put. Any ideas or thoughts I would appreciate. Thanks
Last edited by GROD; 09/25/18 04:22 PM.
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Re: Low RPM issue
[Re: GROD]
#12911807
09/25/18 05:27 PM
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Joined: May 2018
Posts: 630
Ranger 177
Pro Angler
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Pro Angler
Joined: May 2018
Posts: 630 |
I would consider taking to Charlies in Alvarado these guys no there business they can isolate and fix problems. Right now sounds like fixing things to no avail. It gets very expensive when trying to fix and not get right. Just for thought
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Re: Low RPM issue
[Re: GROD]
#12911830
09/25/18 05:35 PM
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Joined: Jun 2003
Posts: 708
wsimpson
Pro Angler
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Pro Angler
Joined: Jun 2003
Posts: 708 |
I had a similar misbehavior on an 03 Ficht 225 HO and it sounds like you are running down one cylinder. Mine was a coil issue. Compression was fine on all cylinders and EVDiags didnt catch it nor where there any active codes/faults. I caught it by replacing all plugs; then, running it under load (on the lake). After returning from the lake, re-examined all plugs and one still looked mint compared to the others.
Mine was lugging out of the hole; on plane RPM slowly crept up with hotfoot fully pressed; wouldnt reach max RPM or speed. Another symptom was a complete lack of power, for example couldnt power load on the trailer.
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Re: Low RPM issue
[Re: GROD]
#12912011
09/25/18 07:21 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Charlies is my next step if fun n sun can get it right this time. I have spent a small fortune already trying to make it right. Will update. Ill let them know about coil possibility... would hope this has already been checked considering the situation but never know. Thanks!!
Last edited by GROD; 09/25/18 07:21 PM.
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Re: Low RPM issue
[Re: wsimpson]
#12912156
09/25/18 09:22 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
I had a similar misbehavior on an 03 Ficht 225 HO and it sounds like you are running down one cylinder. Mine was a coil issue. Compression was fine on all cylinders and EVDiags didnt catch it nor where there any active codes/faults. I caught it by replacing all plugs; then, running it under load (on the lake). After returning from the lake, re-examined all plugs and one still looked mint compared to the others.
Mine was lugging out of the hole; on plane RPM slowly crept up with hotfoot fully pressed; wouldnt reach max RPM or speed. Another symptom was a complete lack of power, for example couldnt power load on the trailer. This is what ive been thinking from the beginning, really sounds like you have a cylinder not firing. Id take a good look at the plugs again, should be obvious.
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Re: Low RPM issue
[Re: GROD]
#12912218
09/25/18 10:33 PM
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Joined: Oct 2016
Posts: 354
Tin Star Cajun
Angler
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Angler
Joined: Oct 2016
Posts: 354 |
GROD, I had the exact same issue as you. It's an easy fix if it's the ignition coil. Look up on YouTube. I also sent you a PM if you want some help with checking it.
The only difference between a little girls scream and a warrior's battle cry is the direction your'e running!
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Re: Low RPM issue
[Re: GROD]
#12912626
09/26/18 04:49 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
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Re: Low RPM issue
[Re: GROD]
#12932072
10/13/18 01:38 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Any updates on your motor? Were the coils ever checked?
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Re: Low RPM issue
[Re: GROD]
#12938750
10/19/18 03:01 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
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Posts: 2,581 |
They said they checked everything, did all possible test, and couldnt find anything wrong with the the motor and said it runs strong. Still only getting 5k rpms and top speed around 54-55 mph. Lot of money thrown down the drain so far chasing the issue.
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Re: Low RPM issue
[Re: GROD]
#12938816
10/19/18 04:02 PM
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Joined: Apr 2017
Posts: 12,145
tmd11111
TFF Guru
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TFF Guru
Joined: Apr 2017
Posts: 12,145 |
If they truly checked everything then Id say your tach is off. Not uncommon
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Re: Low RPM issue
[Re: GROD]
#12939057
10/19/18 07:42 PM
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Joined: Dec 2013
Posts: 459
PlanoPaul
Angler
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Angler
Joined: Dec 2013
Posts: 459 |
Like was mentioned earlier in this post, this boat should be running close to 70mph. Tach could be a problem, but it aint the only problem. You may give Mark Gunter a try, that man has been working on Mercury motors for a LONG time. Sorry for your problems.
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Re: Low RPM issue
[Re: GROD]
#12939166
10/19/18 09:43 PM
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Joined: May 2018
Posts: 630
Ranger 177
Pro Angler
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Pro Angler
Joined: May 2018
Posts: 630 |
Mark is master mercury technician. He will treat you fair not milk it he works out of his house in azle now. 817 626 5693
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Re: Low RPM issue
[Re: GROD]
#12939377
10/20/18 01:41 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Thanks!!! Prob gonna have to wait a few months before I do anything else with it. Azle is near me though.
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Re: Low RPM issue
[Re: GROD]
#12939483
10/20/18 03:38 AM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
When youre running WOT and trimmed up, is the spray from the hull behind you or beside you?
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Re: Low RPM issue
[Re: GROD]
#12939822
10/20/18 06:23 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Ill have to take her out again... havent paid attention to the spray... if your asking if he bow is getting enough lift probably not. New prop I just put on and had worked at Steves gave me 2 more miles an hour and a little better hole shot, but max rpm stil 4900-5k... top speed was 56.2. Tempest 25p 3 Blade... what was recommended for the 200 hp Merc Optimax on the champion forum. Another guy has my exact boat and motor and same jacknplate set up and prop now... he runs 5700-5900 rpm and 71.2 mph.
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Re: Low RPM issue
[Re: GROD]
#12939999
10/20/18 10:41 PM
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Joined: Sep 2009
Posts: 3,644
Droyhef
TFF Team Angler
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TFF Team Angler
Joined: Sep 2009
Posts: 3,644 |
I didnt see anyone ask if your motor was at the propper setting on your jackplate. Also, if it has waterlogged foam from the fiberglass damage that could be a lot of weight you are carrying around. It is strange that you went down in pitch, gained speed, and had no change in rpms. Did you notice any change in plane speed, acceleration, anything?
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Re: Low RPM issue
[Re: Droyhef]
#12940091
10/21/18 01:00 AM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
I didnt see anyone ask if your motor was at the propper setting on your jackplate. Also, if it has waterlogged foam from the fiberglass damage that could be a lot of weight you are carrying around. It is strange that you went down in pitch, gained speed, and had no change in rpms. Did you notice any change in plane speed, acceleration, anything? Yeah, the waterlogged foam is why I was asking where his spray is at on the sides. Mine had water in it and Ive been draining it for a year now, picked up 4mph over the year. Since he had damage to the hull, its a very real possibility.
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Re: Low RPM issue
[Re: GROD]
#12940199
10/21/18 02:51 AM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
I went up in pitch with the tempest 25 (had a new 23 Tempest out of box on it, and when I purchased it it had a 25 Fury) worked at Steves Props I Quitman and josh set motor height and jackplate where it needed to be. Seller didnt tell me about the hull damage when I purchased, and I dont know how long ago it happened. I had it repaired at classic fiberglass. How would I know if its water logged?
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Re: Low RPM issue
[Re: GROD]
#12940536
10/21/18 04:12 PM
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Joined: Feb 2006
Posts: 909
Alumacraft 14
Pro Angler
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Pro Angler
Joined: Feb 2006
Posts: 909 |
Moisture meter, boat body work shop should have one. Thermal vision will work as well. Or redneck it and take a core sample, lol.
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Re: Low RPM issue
[Re: GROD]
#12940604
10/21/18 05:29 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Thanks, just trying to rule out everything possible.
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Re: Low RPM issue
[Re: GROD]
#12940644
10/21/18 06:21 PM
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Joined: Sep 2009
Posts: 3,644
Droyhef
TFF Team Angler
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TFF Team Angler
Joined: Sep 2009
Posts: 3,644 |
I kid you not when I worked for a shop for a while one came in with hard to find runability issues. After months and many techs someone happened to find a bird nest tucked into the cowling out of site. It was causing the issue. I dont remember the exact symptoms but I do remember the bird nest. Go drag your boat across a scale and compare that to manufacture specs on weight for hull motor and allow for fuel load, etc.
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Re: Low RPM issue
[Re: GROD]
#12940939
10/21/18 10:35 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
I had a customer with an 896 Nitro that wouldn`t run. One day I was moving the boat and heard a strange sound. Walked to the back pushed on the hull and it sounded like a barrel of water. Water was trapped in the hull. Drilled some holes at the bottom sides of the bilge. Must of had 60 gallons of water in it.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
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Re: Low RPM issue
[Re: gary purdy]
#12941035
10/21/18 11:39 PM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
I had a customer with an 896 Nitro that wouldn`t run. One day I was moving the boat and heard a strange sound. Walked to the back pushed on the hull and it sounded like a barrel of water. Water was trapped in the hull. Drilled some holes at the bottom sides of the bilge. Must of had 60 gallons of water in it. Exactly what I had to do to get mine draining, I know Ive gotten at least 15 gallons out. So I called a shop about pulling the topcap and removing the foam, nobody would even think about giving me an estimate on the cost. Wouldnt even give me a worst case number, new stringers & etc... Our boats are supposed to have closed cell foam, which isnt supposed to water log; but the water gets trapped around all the voids in the foam and just ssllloooowwwwwlllllyyyyyyyyyy drains out. I dont want to reread the entire thread, are you sure youre getting full throttle with the hotfoot & throttle cable in the cowling? Seems like it could be out of adjustment since the powerhead was replaced. Would also explain the props not having different WOT rpms.
Last edited by grout-scout; 10/21/18 11:44 PM.
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Re: Low RPM issue
[Re: GROD]
#12941880
10/22/18 05:54 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
I talked to Chris at classic fiberglass who did my hull repair, and he stated he didnt think water could have gotten into the foam. He believes my problem is elsewhere. Gonna meet up with a nice man from here on the forum who offered to assist me free of charge, in couple weeks, and rule out couple other things. I hit 57 mph yesterday with new prop worked at Steves in Quitman, but its still only getting 4900-5k rpm.
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Re: Low RPM issue
[Re: GROD]
#12942186
10/22/18 10:23 PM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
Mines a 2005 champ 198 and the water in mine didnt get in there from the bottom either. Lets just say that they mustve had some quality control issues when it came to using sealant around the jackplate bolts and the screws under the transom stainless steel corner piece.
But hopefully yours is really something else, if you do find something let us know.
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Re: Low RPM issue
[Re: GROD]
#12943656
10/24/18 02:45 AM
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Joined: Sep 2009
Posts: 3,644
Droyhef
TFF Team Angler
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TFF Team Angler
Joined: Sep 2009
Posts: 3,644 |
Did your mechanic lake test the boat?
Last edited by Dawson Hefner; 10/24/18 02:46 AM.
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Re: Low RPM issue
[Re: GROD]
#12946775
10/26/18 08:01 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Yes, they cant figure out whats wrong with it. They say the motor is 100% solid... they think its something to do with the prop and set up, but I know its not that from elimination and taking it to Steves out near lake fork.
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Re: Low RPM issue
[Re: GROD]
#12955169
11/04/18 06:52 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Well the new prop worked by josh did help... but still only getting 5100 rpm.., better hole shot for sure and seeing 60 mph. I know every boat and set up are a little different so this may just be all shes got. Thanks.
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Re: Low RPM issue
[Re: GROD]
#12955745
11/05/18 02:13 PM
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Joined: Nov 2007
Posts: 5,515
ssmith
TFF Celebrity
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TFF Celebrity
Joined: Nov 2007
Posts: 5,515 |
if you are only turning 5100 you are still below max rpms
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Re: Low RPM issue
[Re: GROD]
#12955898
11/05/18 04:15 PM
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Joined: Sep 2010
Posts: 2,581
GROD
OP
Extreme Angler
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OP
Extreme Angler
Joined: Sep 2010
Posts: 2,581 |
Yeah I know, I just cant afford to put anymore money into it chasing the problem... Ill change out rpm gauge or what not to make sure thats not the issue and I guy from here on the forum is gonna assist me in checking another possible issue.
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Re: Low RPM issue
[Re: GROD]
#12955957
11/05/18 05:17 PM
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Joined: Jan 2009
Posts: 1,649
spankyttx
Extreme Angler
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Extreme Angler
Joined: Jan 2009
Posts: 1,649 |
you can use a dwell meter on the #1 cylinder to confirm rpm's if your unsure of your tach readout
LI-SI-WI-NWI
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Re: Low RPM issue
[Re: GROD]
#12956261
11/06/18 12:19 AM
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Joined: Dec 2008
Posts: 16,157
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,157 |
Tachs prob right, mine runs 68 at 5600rpm, so I can see 60mph at 5000rpms.
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