
04-10-2009
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Senior Member
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Join Date: Feb 2007
Location: Huntsville, Alabama
Posts: 273
Rep Power: 6
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Mark, I have a 1983 Honda 7.5 hp 4-stroke engine on my C22, and within a few months of when I bought it in 1998, I started having the same problem you are having with the Yamaha.
A friend gave me 2 small, stainless-steal wires, one smaller than the other. I don't know the gauge, but I used them (and continue to use them) to ream out the ports on the carburetor. You'll have to remove the carb from the motor to do this. My friend also recommended that I never run ethanol in the motor if I could avoid it, keep a fuel stabilizer in the tank, and run the engine dry by disconnecting the fuel line at the end of each use. I have done this ever since and have never had the problem again. I find that I have to do the ream-out a couple times a year, and it keeps the motor purring like a kitten.
Give this a try before you go to the expense of a rebuild kit/overhaul.
Pat
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