Evinrude 225 HP outboard 1989

by Paul
(Bullhead Az)

engine at full throttle varies from 4200 rpm to 5500 rpm with no movement of the throttle. This just started to occur on our last outing. It runs mostly at 4200rpm but sporadically will suddenly increase to 5500rpm for short intervals and then back to 4200. Would appreciate any input. Regards, Paul

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