1972 Ski-Doo Shop Manual, Page 61Get this manual
1-10-02 NOTE: Never install more than five (5) drive pulley shims on crankshaft3Install drive pulley assemblyIf offset between drive and driven pulleys is less than specifications adjust as follows: If distance is more
TRANSMISSION
(b) On Ian and Olympique models, loosen the hinge rod nut and tap the chain case rearward to decrease distance (fig1-10-5)