2006 Ski Doo REV Service Shop Manual, Page 107Get this manual
Section 03 ENGINES Subsection 05 (TOP END)
CAUTION: Always install gasket of the proper thicknessFailure to do so may cause detonation and severe engine damageNOTE: Be sure to restore the chamfer around all cylinder sleeve port openingsBefore inserting piston in cylinder no4, lubricate the cylinder with new injection oil or equivalentInstall proper ring compressor on piston assemblyENGINE 377 552 RING COMPRESSOR PN 420 876 090 420 876 972
A17C02A
1Or use exhaust manifold to align cylinders
NOTE: The ring compressor will not fit on over size pistonsCheck flatness of intake sockets no6At cylinder no4 andor cylinder head no3 installation, use aligning tool or exhaust manifold itself to ensure sealing of intake manifold and exhaust before tightening cylinder head nutsENGINE 377 and 552 ALIGNING TOOL PN 420 876 171