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Max Online: 36273 @ 01/23/13 02:34 PM
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#11020651 - 08/04/15 08:49 PM Yamaha 90 hp two stroke, stumps my feeble brain.
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5068
Loc: Marble Falls/Seadrift
All I can tell you is what it isn't...

What it is, motor runs like a champ, and then drops a cylinder, runs on two. Fuel restriction? Glummed up carbs? Nope, and nope because... I can turn the key off, then restart and it jumps up and runs perfect again. Maybe for a while, maybe not, but every time it falters, restarting gets it going strong.

I'm thinking a coil is breaking down, but dang that's weird, anyone have any other thoughts before I start chasing this down?
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Pat Goff
Marble Falls/Seadrift TX

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#11021309 - 08/05/15 07:52 AM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10902
Loc: Littlefield Tx & Lake A. H. US...
Had almost the same problem on a 3 cylinder 2006 50hp Yamaha. Was ready to pull my hair out because ignition would test good. Finally caught it dropping the cylinder and test indicated the power pack. This one had a very expensive power pack.
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“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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#11023771 - 08/06/15 05:33 AM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5068
Loc: Marble Falls/Seadrift
I'll start there Gary, thanks.
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Pat Goff
Marble Falls/Seadrift TX

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#11035670 - 08/11/15 03:23 PM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
bluesea112 Offline
Outdoorsman

Registered: 01/07/11
Posts: 244
Loc: West, TX
I have a 90hp Yamaha 2 stroke and would like to be able to recognize this problem if it arises. Pat, how do you know it is dropping a cylinder and running on two? Does it start running extremely rough and puttering?

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#11037791 - 08/12/15 02:44 PM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
leanin post Offline
TFF Celebrity

Registered: 08/18/09
Posts: 5537
Loc: TEXAS
one of the thermostats are either clogged or not opening and one bank is overheating causing motor to go into limp mode. take stats out and see what it does.
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#11037902 - 08/12/15 03:32 PM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10902
Loc: Littlefield Tx & Lake A. H. US...
Leanin post this motor is an inline 3 cylinder. When a Yamaha goes into protection mode it will barely get above idle but it runs smooth.
_________________________
“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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#11039215 - 08/13/15 08:47 AM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
Pat Goff Online   content
TFF Celebrity

Registered: 01/29/05
Posts: 5068
Loc: Marble Falls/Seadrift
Pretty sure it's a coil breaking down, the thermostats were yanked the day I rigged it. That motor sucks way too much mud through it to have anything restricting water flow.
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Pat Goff
Marble Falls/Seadrift TX

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#11041413 - 08/14/15 08:44 AM Re: Yamaha 90 hp two stroke, stumps my feeble brain. [Re: Pat Goff]
FMJshooter Offline
Extreme Angler

Registered: 06/24/08
Posts: 1390
Loc: Belton, TX
Had a 2 week old CDI coil pack do that to me on a rude v4. Hooked up and zip tied the trigger on an old timing light so I could watch it while runnin. Figured out which cylinder was dropping, switched packs around and she revealed herself.


Edited by FMJshooter (08/14/15 08:51 AM)

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