Bombardier SeaDoo 1989 factory shop manual, Page 61Get this manual
Section 03 ENGINE Sub-section 06 (ROTARY VALVERESERVOIIR) NOTERotary valve IS asymmetricalTherefore, try turninq it inside out then re-install on splines to determine bti installation position
Proceed as followsTurninq crankshaft, bnnq MAGneto side piston to Top gauge Dead Center using TDC'
TDC gaiugie on MAG side
Bring piston at TDC
TDC gauge on MAG side
Bring piston TDC
For opening mark, first align 360' line of degree wheel with BOTTOM of MAGneto side inlet DortThenfind 129' line on degree wheel and mark krankase at this point