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150 Yamaha with carbs

jetman34

New member
"Recently had my boat out for

"Recently had my boat out for several fishing trips out of the keys, above 3000 RPM the engine would surge 300 to 400 RPM without throttle movement, did not do this below 3000 RPM. Other than that engine seem to operate normal, pulled the plugs looked ok, ran some carburator cleaner thru the carbs and added an additive to my fuel tank. Also replaced the water seperator all of this did not help. When running above 3000 RPM and pulling the choke would help for awhile but not always. I think I have a carb jet plugged and may have to rebuild the carbs, Its a 2003 model with a 120 hours on it. has anyone ran into this and am I on the right track to rebuild the carbs."
 
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