2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 141Get this manual
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3 If valve guide is out of tolerance, it must be replacedReplacing Valve Guide NOTE: If valve guide is worn or damaged, it must be replaced
2 Using the Standard Valve Guide Reamer (pn 044