2001 Ski-Doo Factory Shop Manual Volume Three, Page 121Get this manual
Subsection 03
Section 04 ENGINE (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
RECTIFYING SURFACES
Stick fine sand paper sheet on the surface plate then lightly oil the sand paperRub part mating surface on sand paper using 8figure movementsSand until mating surface is perfectly straight
Bring 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 center cylinderBring PTO piston to top dead centerDegree wheel must rotate with crankshaft10 20 30 40 50 60 70 90 80