1971-1973 Arctic Cat Snowmobiles Factory Service Manual, Page 28Get this manual
ENGINE SERVICING (SINGLE CYLINDER) CDRotate the flywheel 14 turn counterclockwiseSlowly rotate the flywheel clockwise until the continuity light brightensWhen the continuity light brightens, it indicates the firing moment of the engineNOTE: The "F" mark and the timing mark in the crankcase should now be alignedInstall the dial indicator adapter into the spark plug holePlace the dial indicator into the adapterNOTE: DO NOT LOCK INDICATOR INTO POSITIONE
If the timing marks are not aligned, loosen the two (2) stator plate retaining screwsWhen the "F" mark is positioned to the right of the crankcase timing mark, rotate the stator plate counterclockwise to advance the timingWhen the "F" mark is positioned to the left of the timing mark in the crankcase, rotate the stator plate clockwise to retard the timingNOTE: The "F" mark and the timing mark in the crankcase should now be aligned