1984 Ski-Doo Shop Manual, Page 110Get this manual
SECTION 02 ENGINE
SUB-SECTION 05 (462 ENGINE TYPE)
To correctly install the rotary valve disc proceed as follows:
- Turning crankshaft counter-clockwise, (drive pulley side) bring magneto side piston to Top Dead Center using .D.CgaugePosition the rotary valve disc on gear to have edges as close as possible to the marksNOTE: The rotary valve disc is asymmetrical, therefore, at assembly, try positioning each side of disc on gear to determine best installation position
INSPECTiON