07 Yanaha F150TLR , 4cycle

by Tom
(Jacksonville, fl)

Rough idle, when you advance the throttle to get on plane, engine feels as if only running on 2 cylinders then when motor gets above approx 2500 rpm sound like it catches and then all cylinders seem to fire and motor runs fine. Have changed all filters, plugs etc. Took it to dealers and they replaced a valve control. still having problems. I am out of ideas....

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