Hi, My boat has an 85 hp yamaha and has sat for a year and now it won't reach top rpm's. I checked the fuel pump and it seemed to be fine. It has fresh fuel as well. It runs up to 3500 rpm and just levels out, also it seems to be taking a while to get there. Should I take the carbs off and clean them? It doesn't seem to be missing either. Any help would help! Thanx
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Boat not reaching top rpm
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Carbs probably would need a good cleaning since they probably are gummed up from dried up fuel and oil in the lines, pump, and carb bowls
After sitting that long, I would check compression first to make sure the cylinders are sealing. If the motor was not stored properly there can be rust on the cylinders, bearings, and crank.
then check spark an all cylinders at problem RPM. timing light will help see that.
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