2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 140Get this manual
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ATV-1082
NOTE: The valve seals must be replaced
3 Remove the valve springs; then invert the cylinder head and remove the valvesMeasuring Valve Stem Runout
ATV-1004