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    Yamaha C60 knocking noise at higher revs

    My C60 has developed a knocking noise at higher revs. It is unnoticable when running at low speeds or when not in gear. I did replace the water pump impellor last season. Afraid I can't remember whether that immediately preceded the appearance of the noise or not. I did not use the boat again...
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    What speed should I get (rough idea)

    Have been researching a lot on the web and read a lot of advice on prop selection but would like a wee bit of advice.... I have a 20ft x 8ft Cape Island boat, all fibreglass (its quite heavy). On it I have a 45hp Johnson commercial (no tacho) and a Johnson 8hp kicker. I get around 5.5 kn out of...
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