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1985 Yamaha 90 Motor seems to start and idea good. The problem starts under load @2100 RPM

glbarnes59

New member
boat
Motor seems to start and idea good.
The problem starts under load at it spits and sputters if I try to push the throttle over 2100 RPM


1: connected engine to clean fresh gas tank and added sea form. Ran for 20 minutes and let sit over night.
2:Tested compression all 3 cylinders are 80.
3: checked and cleaned fuel filter
4: spark plug wire removed 1 at a time could hear sparking on all three tried covering carburetor with a rag bottom carb made little difference
5: I tried squeezing the primer bulb hard when it was spiting and sputtering and everything stayed the same.
6: rebuilt carburetors



 
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