1989 Ski-Doo Repair Manual, Page 213Get this manual
Section 02 ENGINE Sub-section 09 (ENGINE DIMENSION MEASUREMENT)
The following is required for the adjustment procedure- adjustment shims (refer to parts catalog) thicknesses available:0.10 mm0.20 mm.30 mm0.50 mm1.00 mmmicrometervernier Total shim thickness needed for the end-play adjustment is determined with the following procedurea) Measure crankcase halves as illustrated (M, and M2}A standard compressed crankcase gasket will have .30 mm (.012 in} thickness tM31Add these measurements to obtain dimension I'A"
c) Measure distance between bearing shoulders on crankshaft (MslMeasuring Me
(.004 (.008 (.012 (.020 (,040
in) in) in) in) inl