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Problem Finally Solved!
It was a fuel problem that was created from the "gray" OEM Mercury Marine fuel hoses (see pic) that connects the main fuel tank to the motor and to the fuel pump. This gray fuel hose unfortunately has an inner lining failure where the lining starts to flake off like...
OK, just an update in case anyone else is having this issue. I have now replaced all the CDI's, fuel pump, both fuel filters, RPM limiter and rebuilt all 4 carbs and still the high speed cutout occurs until the engine has been run for about 5 minutes at high speed. Once the engine is warm...
@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...
@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...
@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. :)
@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...
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...
