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CRF 450x engine noise at higher rpm

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First post so I hope this works. Looks like there is a lot of good knowledge tapping into these forums so I'm hoping to find a little.

Yesterday i noticed a wierd sound coming from my engine. It starts and runs fine but noise like a loose parts badly vibrating starts at a higher RPM. If I rev the engine a little more the noise goes away, when I drop the RPM to the same range the noise comes back and then quits at the same RPM it started. I didn't check it to many times for fear of causing real damage but it seems to be real consistant at the same RPM. Any ideas?

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Probably something 'innocuous' like buzzing levers, loose headlight, or similar.

Get a buddy with a good set of ears to help you 'sniff' out where the sound is coming from.

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I also have had an aftermarket aluminum skid plate for a couple of years and never had a problem. Out of the blue, my bike started making noises like you describe. I took the skid plate off and, sure enough, it was the problem. I put a couple of strips of tape between the skid plate and the frame and it cured the problem.

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Thanks guys. I took the skid plate off and the noise is gone. It is an aluminum after market plate. Must have loosened up just a little.

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I just put an aftermarket skid plate on my X after owning it for a year. And my first ride was yesterday and now it has a new rattly sound.

Even with it on there snugly, I understand from other TT posters that this is to be expected as the skidplate reflects the engine sounds back up at you. They are right.

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