2005 Ski-Doo RT Series Shop Manual, Page 97Get this manual
Section 02 ENGINE Subsection 09 (ENGINE MEASUREMENT)
A35C31A
A35C30A
RING END GAP
Position ring halfway between transfer ports and intake portNOTE: In order to correctly position the ring in the cylinder, use piston as pusherUsing feeler gauge, check ring end gapReplace ring if gap exceeds specified tolerance1
1Measuring perpendicularly (90) to piston pin axis A33 mm (1.3 in)