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Dec 30th, 2023
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 Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: Stump jumper]
#11741616
07/25/16 09:23 PM
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Joined: Jul 2016
Posts: 134
dustinmoorman
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Outdoorsman
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I disabled my idle stabilizer after many years but really did not notice any real difference. Might need to adjust your timing a little to bring your idle up. I idle about 800 on water in neutral. Like someone else said you need to get the WOT rpms up to 5600 minimum. Mine will top out at 6000+ in cooler temps and a few hundred less in hot weather. What prop you running? I run a 23p Tempest plus. Steve blueprinted and balanced it. He said that without the milled heads the Laser II would be best. On your motor that is what I would run. If you have the small gear case then a 22 might be right depending on the boat.
Alright - for the prop I have, it is a Laser2 25P. Does this sound about right for a 150HP Mercury? Tomorrow afternoon I'll be out on the lake running the boat under load and I should be able to pinpoint my top end WOT RPM. What would going to a Laser2 23 or 22 pitch do for me versus my 25 pitch? (going to read about prop pitch right now)
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742043
07/26/16 01:23 AM
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Joined: Feb 2006
Posts: 3,774
bronco71
TFF Team Angler
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Joined: Feb 2006
Posts: 3,774 |
25p is way too much, I bet your holeshot is awful...
23p should raise your WOT RPM by about 400 rpm and make your holeshot better
22p should raise your WOT RPM by about 600 rpm and make your holeshot a lot better
but if you change to a different prop than a Laser 2 more things come into play due to blade differences....
1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: bronco71]
#11742070
07/26/16 01:40 AM
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Joined: Apr 2004
Posts: 14,088
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,088 |
25p is way too much, I bet your holeshot is awful...
23p should raise your WOT RPM by about 400 rpm and make your holeshot better
22p should raise your WOT RPM by about 600 rpm and make your holeshot a lot better
but if you change to a different prop than a Laser 2 more things come into play due to blade differences.... I bet previous owner thought bigger is better. Holeshot has to stink with that 25. I agree with bronco71. I see you are in Rockwall. I have plain 23 Laser you could try if you have the large gear case and a Flo torque hub. I will take a look at it and check the condition. Steve put it on the pitch block so I think it is good to go.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742412
07/26/16 10:11 AM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
what year is tha Mag?.. measure tha hub.. good possibility it has tha 1.78 gear case which is gonna limit props and make pitch more important... as for tha idle it needs ta be set in tha water, in gear with normal load... makes no difference what "anything" or anyone calls for.. its whatever makes you and tha motor happy... you do know idle speed and/or rpm is set with "timing only" right?
Last edited by TLW; 07/26/16 10:20 AM.
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: TLW]
#11742416
07/26/16 10:25 AM
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Joined: Apr 2004
Posts: 14,088
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 14,088 |
what year is tha Mag?.. measure tha hub.. good possibility it has tha 1.78 gear case which is gonna limit props and make pitch more important... as for tha idle it needs ta be set in tha water, in gear with normal load... makes no difference what "anything" or anyone calls for.. its whatever makes you and tha motor happy... you do know idle speed and/or rpm is set with "timing only" right? I figured he had the small gear case myself but the 25p made me wonder. Normally the props for the small cases come in even pitches. 22, 24, etc.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742428
07/26/16 10:56 AM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
they come in justa 'bout all pitches.. ie: original trophy's, laser's and were odd numbers and small hub...think when tha II series on both came out tha hubs and pitches changed.. to old ta remember for sure.
Last edited by TLW; 07/26/16 11:00 AM.
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: Stump jumper]
#11742439
07/26/16 11:21 AM
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Joined: Jul 2016
Posts: 134
dustinmoorman
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Outdoorsman
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Joined: Jul 2016
Posts: 134 |
25p is way too much, I bet your holeshot is awful...
23p should raise your WOT RPM by about 400 rpm and make your holeshot better
22p should raise your WOT RPM by about 600 rpm and make your holeshot a lot better
but if you change to a different prop than a Laser 2 more things come into play due to blade differences.... I bet previous owner thought bigger is better. Holeshot has to stink with that 25. I agree with bronco71. I see you are in Rockwall. I have plain 23 Laser you could try if you have the large gear case and a Flo torque hub. I will take a look at it and check the condition. Steve put it on the pitch block so I think it is good to go. Ahhhh, man that sucks. I was actually planning on taking her out today in the afternoon. If you are in Rockwall as well, I am up and about and would be glad to invite you over to check it out, Stump. If you would let me try the 23 I would be very grateful and if it helped out and you were willing to sell it I would have some cash for you too. I'll send a PM your way and see if you have some time. Thanks! (Oh as for the motor year, it is a 1997.)
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742456
07/26/16 11:46 AM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Posts: 2,848 |
"might" be big case 1.87.. don't remember exactly what year tha little case went away for sure... thinkin' mid 90's.. need ta measure it.. there's also a good chance it's not orginal.. tha little case's had weak spots!
jus thought.. how many water intake holes?
Last edited by TLW; 07/26/16 11:50 AM.
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: TLW]
#11742473
07/26/16 12:09 PM
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Joined: Jul 2016
Posts: 134
dustinmoorman
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"might" be big case 1.87.. don't remember exactly what year tha little case went away for sure... thinkin' mid 90's.. need ta measure it.. there's also a good chance it's not orginal.. tha little case's had weak spots!
jus thought.. how many water intake holes? Alright TLW, forgive me if these pictures suck or don't help out. I think this is what you need to see.  Or possibly  Does this help? Thanks!
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: TLW]
#11742480
07/26/16 12:15 PM
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Joined: Jul 2016
Posts: 134
dustinmoorman
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Outdoorsman
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"might" be big case 1.87.. don't remember exactly what year tha little case went away for sure... thinkin' mid 90's.. need ta measure it.. there's also a good chance it's not orginal.. tha little case's had weak spots!
jus thought.. how many water intake holes? That was my attempt at "hub measurement" as for the question for water intake holes. Appears to be 8 on each side: 
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742506
07/26/16 12:35 PM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
big case.. probably 1.87 gear...maybe 2 ta 1 but doubt it with what ya say wot rpm is.. set up ie: offset, motor height, prop really needs ta be done.. motor needs ta turn 5600 ta 5800 min. wot.. go see Josh/Steve at fork.. avoid all tha "lets do this or that".. you can speed endless amount of time (and cash) tryin stuff when everyone is "guessin' at what ya need ona computer and your knowledge of all this stuff is limited.. no insult intended.. jmo
Last edited by TLW; 07/26/16 12:36 PM.
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: TLW]
#11742583
07/26/16 01:19 PM
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Joined: Jul 2016
Posts: 134
dustinmoorman
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Outdoorsman
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big case.. probably 1.87 gear...maybe 2 ta 1 but doubt it with what ya say wot rpm is.. set up ie: offset, motor height, prop really needs ta be done.. motor needs ta turn 5600 ta 5800 min. wot.. go see Josh/Steve at fork.. avoid all tha "lets do this or that".. you can speed endless amount of time (and cash) tryin stuff when everyone is "guessin' at what ya need ona computer and your knowledge of all this stuff is limited.. no insult intended.. jmo True, my knowledge on outboards is limited. This is my first one, but I'm having fun learning and making as many mistakes along the way as possible.  I'm just trying to make it to winter before I drop it off at a shop. I'll fish it til it breaks or winter, whichever comes first. I don't mind a couple of quick fixes if I can fit them in beforehand and learn something from them 
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742694
07/26/16 02:13 PM
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Joined: Nov 2006
Posts: 2,848
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,848 |
thats tha way this "sickness" always starts!.. do ya need a manual for that motor?
Last edited by TLW; 07/26/16 02:15 PM.
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: TLW]
#11742847
07/26/16 03:31 PM
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Joined: Feb 2006
Posts: 3,774
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,774 |
big case.. probably 1.87 gear...maybe 2 ta 1 but doubt it with what ya say wot rpm is.. set up ie: offset, motor height, prop really needs ta be done.. motor needs ta turn 5600 ta 5800 min. wot.. go see Josh/Steve at fork.. avoid all tha "lets do this or that".. you can speed endless amount of time (and cash) tryin stuff when everyone is "guessin' at what ya need ona computer and your knowledge of all this stuff is limited.. no insult intended.. jmo So true, I wouldn't spend a lot on props till you get it dialed in closer by a pro prop guy like Steve or if you can borrow props to narrow it down to get into the correct WOT rpm, then it can be fine tuned to your rig. I'd bet a 22p or 23p will make a huge difference.
1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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Re: Mariner Magnum III Hard Starts - Expected Behavior?
[Re: dustinmoorman]
#11742965
07/26/16 04:23 PM
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Joined: Dec 2014
Posts: 1,665
Muzzlebrake
Extreme Angler
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Extreme Angler
Joined: Dec 2014
Posts: 1,665 |
FYI. My boat is about same weight and hull design as yours. Tracker Avalanche 18DC. My EFI 150 Merc uses a Tempest Plus 23P and has good hole shot and will rev to 6000k if I trim it out far enough. At +1/4 trim it hits 5600 and 56mph gps. After 5600 the rev limit alarm and high heat alarm will go off.
If you are running 25P prop then you are over propped. Depending on prop design you should be running a 22 or 23 pitch. With your motor fully tucked in you should still see minimum 5000rpm WOT with the correct prop.
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."
Then He made the earth round...and He laughed and laughed and laughed!
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