1982 Ski-Doo Shop Manual, Page 77Get this manual
SECTION 02 ENGINE SUB-SECTION 04 (454 ENGINE TYPE)
For example132 opening 52 closing Using angle finder, mark crankcase at 132 from bottom edge of magneto side inlet port
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 T.D.Cgauge- Position the rotary valve disc on gear to have edges as close as possible to the marks