1997 Ski-Doo Factory Shop Manual Volume One, Page 87Get this manual
Section 03 ENGINE Sub-Section 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
CHECKING SURFACE FLATNESS
Intake manifold, intake manifold cover, rotary valve cover can be checked for perfectly mating surfacesLay part on surface plate (marble, mirror or thick glass plate)Holding down one end of part, try pushing down the other endIf any play is felt, part must be rectified
CHECKING CRANKSHAFT ALIGNMENT
Install degree wheel (P414 3529 00) on crankshaft endRemove both spark plugsInstall TDC gauge (PN 414 1047 00) in spark plug hole on MAG sideBring MAG piston at top dead centerRotate degree wheel (not crankshaft) so that 360 mark aligns with center of crankcaseScribe mark on crankcaseRemove TDC gauge and install it on PTO sideBring PTO piston to top dead center10 20 30 40 50 60 70