1985 Force 85 HP Stumbles at full RPM?

Glen Grenier

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Aug 2, 2008
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1
My 1985 Force 85 HP runs well through the RPM range with the exception that at full throttle, the engine runs well for 10-20 seconds and then begins to stumble/hesitate/cut in out, as if it were starving for fuel. A slight back off on the throttle results in smooth operation. I have had someone pump the fuel bulb during this event and the person said it hesitated more when he squeezed the bulb. I was suspecting fuel pump capacity or something before this but now am perplexed. Again, engine achieves peak rpm and runs well for a few seconds, then "starves and picks up or starves until throttle is reduced slightly. Any Ideas? Thanks in advance.
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,988
Re: 1985 Force 85 HP Stumbles at full RPM?

Likely a dirty sticky float needle valve in one or more of the carbs. Time to clean/rebuilt them.
 
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