texasfishingforum.com logo
Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
TraeMartin, Power-Pole CS, T-Rigger, JoeGoes, EcKo
119150 Registered Users
Top Posters(All Time)
hopalong 120,565
TexDawg 119,511
Bigbob_FTW 94,876
John175☮ 85,892
Pilothawk 83,259
Bob Davis 81,478
Mark Perry 72,280
Derek 🐝 68,311
JDavis7873 67,416
Forum Statistics
Forums59
Topics1,037,801
Posts13,934,738
Members144,150
Most Online39,925
Dec 30th, 2023
Print Thread
Need help diagnosing a motor problem #11078570 09/02/15 03:46 PM
Joined: Feb 2014
Posts: 86
F
fishfor5 Offline OP
Outdoorsman
OP Offline
Outdoorsman
F
Joined: Feb 2014
Posts: 86
I've got a 91 champion with a 1991 Yamaha 150 pro-v it's been a great rig for a few years and the only maintenence that it's needed have been new plugs. I took it out on Conroe the other day and it ran good to the first few holes then I ran back to the marina to pick up a friend and when we went to make a run back to another hole it wouldn't plane out. Even when stuck to the floor it wouldmy budge.I don't have an rpm gage but I could tell it wasn't getting very good rpms. My guess is that my carbs are clogged. Can anyone throw their opinions my way?

Re: Need help diagnosing a motor problem [Re: fishfor5] #11078800 09/02/15 05:11 PM
Joined: Apr 2004
Posts: 13,991
S
Stump jumper Online Content
TFF Guru
Online Content
TFF Guru
S
Joined: Apr 2004
Posts: 13,991
Unless you got to the bottom of the tank and it just sucked in some trash I would suspect something electrical rather than carbs. Normally on my Merc I will get some kind of warning (i.e. surging) if it is carbs. My off the wall guess is power pack or stator.


2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
Re: Need help diagnosing a motor problem [Re: fishfor5] #11078855 09/02/15 05:42 PM
Joined: Jan 2005
Posts: 7,485
R
redchevy Offline
TFF Celebrity
Offline
TFF Celebrity
R
Joined: Jan 2005
Posts: 7,485
The fuel pickup is always on the bottom of the tank, it doesn't float on top.

Fuel pump or carbs is my guess.

Re: Need help diagnosing a motor problem [Re: fishfor5] #11078967 09/02/15 06:35 PM
Joined: May 2003
Posts: 11,586
gary purdy Offline
TFF Guru
Offline
TFF Guru
Joined: May 2003
Posts: 11,586
Check to make sure throttle is working right. Something interfering with the hot foot, cable messed up or throttle follower backed off.


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
Re: Need help diagnosing a motor problem [Re: fishfor5] #11079138 09/02/15 07:53 PM
Joined: Aug 2009
Posts: 7,007
L
leanin post Offline
TFF Celebrity
Offline
TFF Celebrity
L
Joined: Aug 2009
Posts: 7,007
make sure it isnt running hot or not getting oil and going into limp in mode.


COMING SOON! .. THE STICKLE HOOK " the stay level sickle hook". sits level in the water with all knots.! Provides better hook sets and more natural jigging motion. No more adjusting the knot, gluing , or tying loop knots that cause the hook point to tangle in the loop, or worse knick the line.. The jighook that will make all others obsolete !
Re: Need help diagnosing a motor problem [Re: redchevy] #11079252 09/02/15 08:49 PM
Joined: Apr 2004
Posts: 13,991
S
Stump jumper Online Content
TFF Guru
Online Content
TFF Guru
S
Joined: Apr 2004
Posts: 13,991
Originally Posted By: redchevy
The fuel pickup is always on the bottom of the tank, it doesn't float on top.

Fuel pump or carbs is my guess.
BF on my part. I don't think this motor has a limp mode but not familiar with yammies. OP keep us posted. Like to hear how this one turns out. No tach on a 150?


2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
Re: Need help diagnosing a motor problem [Re: fishfor5] #11079291 09/02/15 09:01 PM
Joined: Feb 2014
Posts: 86
F
fishfor5 Offline OP
Outdoorsman
OP Offline
Outdoorsman
F
Joined: Feb 2014
Posts: 86
thanks for the replies guys, im about to do a gas test and make sure i have no water in my fuel. im also going to try to drain the carbs if there is any water in my fuel.

Re: Need help diagnosing a motor problem [Re: fishfor5] #11092357 09/09/15 05:50 PM
Joined: Apr 2004
Posts: 13,991
S
Stump jumper Online Content
TFF Guru
Online Content
TFF Guru
S
Joined: Apr 2004
Posts: 13,991
A carb flooding will cause it to bog when you hit the throttle. I had a seat back out once but mine would hardly even idle when that happened. Might pull the airbox cover and pump the primer bulb hard and see if gas pores out or more of the throats. I also had a bad set of needle and seats right out of the package once. It drove me and my mechanic crazy trying to figure it out. I even called the Merc technical line. I got the instructor up in Richardson. I told my mechanic what he said and my mechanic laughed. They said they went to school together and had races rebuilding lowers. The tech said that Merc float settings are touchy and they should be wet set. I have never had a problem setting the floats. This brings up something else and that is if you have the plastic floats you might have a pinhole. This will cause the float to sink and the carb will flood.


2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
Re: Need help diagnosing a motor problem [Re: fishfor5] #11093403 09/10/15 01:26 AM
Joined: Sep 2009
Posts: 3,644
D
Droyhef Offline
TFF Team Angler
Offline
TFF Team Angler
D
Joined: Sep 2009
Posts: 3,644
Just get a fuel sample in a clear jar and let it sit.
If it seperates at all you got water. It will probably have water in the bowls if it's in the tank.


http://www.texasmegafishadventures.com
Guided rod and reel fishing trips for Alligator gar on the Trinity River as well as some other places
903-721-4296
dawson@texasmegafishadventures.com
Re: Need help diagnosing a motor problem [Re: fishfor5] #11097399 09/11/15 11:10 PM
Joined: Sep 2010
Posts: 1,599
B
boatwhisperer Offline
Extreme Angler
Offline
Extreme Angler
B
Joined: Sep 2010
Posts: 1,599
check spark and compression first thing if those check out then it is a fuel issue you are probably going to find that you have no spark on one or more cylinders


boatwhisperer
Re: Need help diagnosing a motor problem [Re: fishfor5] #11102699 09/14/15 03:17 PM
Joined: Aug 2015
Posts: 8
D
Dave F Offline
Green Horn
Offline
Green Horn
D
Joined: Aug 2015
Posts: 8
You might want to look at the magnets inside the flywheel. They become loose and then bunch up as the engine is used. Sometimes they space themselves out and the engine runs fine. then they bunch up and the engine runs like [censored]. Just my 2 cents.... good luck!

Previous Thread
Index
Next Thread

© 1998-2022 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide
Powered by UBB.threads™ PHP Forum Software 7.7.3