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    2003 115HP Mercury 2 stroke engine - cylinder cuts out when cold at full throttle

    @Texasmark Plugs 3&4 actually look good and have been replaced twice this year just to be sure they are not the problem. And that sneaky small fuel filter that feeds the check valves was replaced as well as the main fuel filter and the check valves. Also totally a sea foam fan and yes, it's...
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    2003 115HP Mercury 2 stroke engine - cylinder cuts out when cold at full throttle

    @flyingscott I can certainly check the actual RPM is around 1800, since when I posted 2500 that was just where I felt it was. Not sure a timing light can help much since at the higher RPMS >3000, missing a flash or two could be un-noticeable. One suggestion made to me was place an inductive...
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    2003 115HP Mercury 2 stroke engine - cylinder cuts out when cold at full throttle

    @DeepCMark58A You bet. It's part of my standard operating procedure just to ensure an easy start versus running the starter for minutes to draw fuel. :)
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    2003 115HP Mercury 2 stroke engine - cylinder cuts out when cold at full throttle

    @Dave1027 So yes, I normally do let it idle on the two cylinders at the dock and even a little ways out into the lake before nailing it home. So typically a good 5 minutes of run time on the 2 cylinders before trying to get all 4 fired up. I'm not leaning to the fuel pump since it's a hard...
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    2003 115HP Mercury 2 stroke engine - cylinder cuts out when cold at full throttle

    So this is a 2+2 engine. That is under approx. 2500 rpm, only 2 cylinders in use, over 2500 rpm then the bottom two kick in with the high speed jet in the carburetor. Now the problem: When the engine is cold (first time started during the day), when I accelerate to Wide Open Throttle (WOT), as...
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