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1988 15 hp runs great until I run at idle for 20 min. then upon throttle-up, takes off fine for few seconds then dies down. If throttle held open, motor surges on and off. Have had it to the shop 3 times, they cannot replicate the issue in a tank. Carb has been re-built, new fuel pump, new gas tank, tried different tank hose. Any suggestions out there. Motor is in great shape for 1988.
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Who rebuilt the carb?
Have the hoses inside the Cowling gotten soft (maybe collapsing?) from ethanol fuel?
Was there any trash in the carb(s) when it was rebuilt the first time? What about the filter, any trash when first replaced? It's always wise to identify what is found when carbs, or filters are replaced. It can direct to what can be affected.
Surging is an indication of fuel issues, when motor surges have you tried to pump the bulb? Did that do any good?
Post back when able. Good luck. -
motor ran good after carb rebuild for a while. have been reading some articles and am wondering if a coil is breaking down or the power supply. when engine dies down, sounds like the motor has been turned off.Comment
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