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Just put on my new lower unit on my optimax 225 / everything just fell in place / fired it off but in forward it makes a knocking sound but not all the time / in reverse no noise at all / is this normal ?
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I would guess you have a stainless steel prop and your running it on land in fwd when you hear the knock. That is because of the heavy prop. Basically because there is no load, the clutch is backing off and catching up again. It is perfectly normal and will not make the noise in the water. Let me know if you have any more questions.
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