1989 Ski-Doo Repair Manual, Page 57Get this manual
Section 02 ENGINE Sub-section 02 (253 ENGINE TYPE)
CAUTION: Circlips must not move freely in the groove after installationIf so, replace them
1, Integral cylinder head
Before inserting piston in cylinder, lubricate it with new injection oil or equivalentInstall ring compressor assembly(P IN
420 8769 70) on piston
The ring compressor will not fit on oversize piston
Remove spark plugInstall integral cylinder head, then rotate crankshaft to position