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Wr 450 ticking noise

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My 03 wr 450 is now making a loud ticking sound in the middle/upper part of the left side around 1700 rpm.

Its not there at idle or in the upper rpm range.

It sounds like a spark plug wire arcing. (only louder)

My valve clearence is in spec.

Has anybody else had this problem or have any ideas what it could be.

The bike still runs great.

Thanks alot guys. :thumbsup:

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