merc 50hp two stroke, three cyl. 1996

by Ken OLeary
(Kenmore, NY, USA)

My 50hp two stroke surges at about half to two thirds throttle. But, will reach wide open throttle and run ok there. What causes this. It has fresh fuel (I only run non-ethanol), brand new fuel hose, new bulb, new fuel pump diaphragms and check valves, carburetors cleaned recently.

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