1989 Ski-Doo Repair Manual, Page 113Get this manual
Section 02 ENGINE Sub-section 04 (467 ENGINE TYPE)
Magneto side pisron
must b4I at TOe
7,15 Rotary valve shaftgear
Bec:klash check Engine do not have to be overhauled to check backlash of crankshaft and rotary valve shaft gearsRemove spark plugs, cover and rotary valveCheck backlash at one position then turn crankshaft about 18 turn and recheckContinue this way to complete one revolutionBacklash must be even at aU positionsOtherwise, over haul engine to find which part is faulty (gear, rotary valve Shaft or crankshaft with excessive deflectionlCheck for presence of brass filings in gear housingRe place gear if needed
A013 002 Olll
Spray some injection oil on rotary the rotary valve cover
Besides, check deflection of rotary valve shaft and crankShaft close to gearReplace as neededbefore closing