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2000 F 100hp Yamaha Sputters at high RPM

louegee

New member
I have a 2000 model F100. It starts great, runs great up to about 3500 RPM...smooth, quiet and steady. I can run it all day at that RPM. If I give it more throttle it will skip and miss and sputter and bog down. I can back off the throttle and give it about 15 seconds, throttle it back up and then it will run great up to 3500 RPM.

I have had the carbs removed and "boiled out," new plugs, new fuel filter, and I have replaced all of the gas so that it is fresh. Is there an automatic timing advance in this motor that could be bad?
 
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