2007 Arctic Cat Four-Stroke Factory Service Manual, Page 64Get this manual
CleaningInspecting Piston Rings ! NOTE: If replacing the rings, make ring-groove cleaning tool by taking an old piston ring and snapping it into two pieces; then grind the end of the old ring to 45 angle and to sharp edge
Using ring-groove cleaning tool, clean carbon from the ring-groovesBe sure to position the ring with its tapered side up
! CAUTION
2Minimum valve spring free length must not exceed speficiations! NOTE: With the crankshaft at top dead center on the compression stroke, install the valve springs and spring retainers; then compress the valve springs and install the valve keepers
Improper cleaning of the ring-grooves by the use of the wrong type of ring-groove cleaner will result in severe damage to the piston
Measuring Piston-Ring End Gap (Installed)
PISTON ASSEMBLY
! NOTE: Oversized pistons are available allowing the cylinder to be bored oversized! NOTE: Whenever piston, rings, or pins are out of tolerance, they must be replaced