Yamaha 25 mlh running poor above 1/2 throttle

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Hounrunner2

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May 20, 2021
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Rutland MA
I have a 2006 Yamaha 25mlh that skips/ coughs above 1/2 throttle it starts great and will idle and troll all day.

I have cleaned the carbs, changed the plugs, switched fuel tank and line, sinked the carbs and reset the timing with no change in operation. I checked the coils and they are .5 ohms primary and 3.2 ohms secondary.

Any suggestions on what could be causing this poor operation at higher rpms would be greatly appreciated. Just as a little background I have owned this motor since new and this is the first time I have had to do any work on it.
 
Sounds like a restriction in fuel flow that’s starving your motor at high rpms. Fuel pump? Also a worn connector on either end of your fuel line can cause this problem.


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Just to close the loop on this in case anyone else has a similar issue. I found a wire from my charging system that was shorting to the case.
 

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