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Knocking noise in motor #14044029 06/26/21 06:42 PM
Joined: Feb 2006
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kirbydog Offline OP
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I have a 2004 Johnson 2 stroke 40 hp. It starts right up and idles smoothly and runs great until I get to about
2/3 full throttle and then I get a knocking noise out of the engine. If I go down on rpm's to below 2/3 the knocking goes away.

Any ideas on what this could be. I changed the lower and no meta shavings in the oil at all.

Any help would be appreciated.

Re: Knocking noise in motor [Re: kirbydog] #14045433 06/28/21 03:43 PM
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kirbydog Offline OP
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Anybody have an idea of what is causing this-I'm assuming something is seriously wrong with the motor but was
hoping I could get an idea of what the cause is.

Re: Knocking noise in motor [Re: kirbydog] #14045441 06/28/21 03:50 PM
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me and the boys Offline
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Knocking is never good. Start with a compression test.

Re: Knocking noise in motor [Re: kirbydog] #14045596 06/28/21 06:17 PM
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rb7764 Offline
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could be many things. can you post a video?

Re: Knocking noise in motor [Re: kirbydog] #14045847 06/28/21 10:06 PM
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boatman025 Online Content
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could have a tooth off a gear


Hughes Marine
3855 Osage Lane
Wylie ,Texas
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