Bombardier SeaDoo 1992 factory shop manual, Page 91Get this manual
Sub-section 06
Sectioln 03 ENGINE (ROTARY VALVE AND RESERVOIR)
Rotary Valve Cover and Valve Clearance
The clearance between rotary vallve cover and valve must be 0.28 0.06 mrn (0.011 0.002 in]
For the following instructions, let's use these specifications as exampleOPENING115' BTDC CLOSING80' ATDC Proceed as follows :
NOTEIf clearance is below 0.22 mrn (0.009 in) rt could create an overheating situation and clearance is over 0.34 mrn (0.013 in) it could create hard starting situation- Turning crankshaft, bring MAG side piston to Top
Dead Center using TDC gauge
Rotary Valve Timing
CAUTIONNever use the ridge molded in crankcase as timing markThe following tools are required to measure rotary valve opening and closing angles in relation with MAG side piston