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06 Kx250f knocking noise

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Hi, I have a 2006 kx250f that's making a very loud knocking noise coming from what I thought was the top end, the noise wasn’t very noticeable at first but after 30-40 minutes of running on a track it became very loud. The bike has recently had a new piston and cam chain, hotrods conrod kit fitted, and also I've recently fitted an 07 transmission in as the 06 transmission destroyed itself! These parts have only had about 2-3 rides on them. I sent the cylinder head away to have it checked out for any possibly causes but that came back fine, I've also measured the piston and cylinder to check the clearance between them but that is within spec. What else could be causing this noise?:thumbsup:

Thanks

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Did you replace the crank bearings when the crank was installed?
Yup they were replaced.

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Possibility who rebuilt your crank didn't not ballence it right or the Conroe bearing was damaged.

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If that was the case surely the noise would have started after I rebuilt it? Its had a few rides after the crank rebuild with no problems?

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