2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 75Get this manual
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Measuring Valve Stem Outside Diameter
2 Acceptable width range must be within specificationsMeasuring Valve Face Radial Runout
4 Maximum "wobble" deflection must not exceed specific