2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 261Get this manual

2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 261

2Lubricate each valve stem with light oil; then apply small amount of valve lapping compound to the entire seating face of
of the valve seals; then place lower spring seat and valve guide seal over each valve guide PISTON ASSEMBLY NOTE: Whenever
piston, rings, or pin are out of tolerance, they must be replaced CleaningInspecting Piston 1Using non-metallic carbon removal
tool, remove any carbon buildup from the dome of the piston2Inspect the piston for cracks in the piston pin, dome, and skirt
areas3Inspect the piston for seizure marks or scuffingRepair with #400 grit wet-or-dry sandpaper and water or honing oilNOTE:
If scuffing or seizure marks are too deep to correct with the sandpaper, replace the piston 2Insert each valve into its original
valve location3Install the valve springs with the painted end of the spring facing away from the cylinder headNOTE: If the
painted end is not visible, install the ends of the springs with the closest coils toward the head 4Inspect the perimeter