1980 Ski-Doo Shop Manual, Page 154Get this manual
SECTION 03 SUB-SECTION 03, (IGNITION TIMING)
e With gauge in adaptoradjust roller so that it is parallel with dial faceTighten roller lock nut
Engine type
Direct measurement
Indirect measurement B.T.D.C
Outer rmg set screw
207 mm 0.25 (.081" 010) 2.35 mm 0.25 (.093" 01O)