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Knocking noise in motor

Posted By: kirbydog

Knocking noise in motor - 06/26/21 06:42 PM

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.
Posted By: kirbydog

Re: Knocking noise in motor - 06/28/21 03:43 PM

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.
Posted By: me and the boys

Re: Knocking noise in motor - 06/28/21 03:50 PM

Knocking is never good. Start with a compression test.
Posted By: rb7764

Re: Knocking noise in motor - 06/28/21 06:17 PM

could be many things. can you post a video?
Posted By: boatman025

Re: Knocking noise in motor - 06/28/21 10:06 PM

could have a tooth off a gear
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