1999 Ski-Doo Factory Shop Manual Volume Two, Page 135Get this manual
Section 04 ENGINE Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT) A13C0OA F01D3PA
TYPICAL
The gap can be measured with the engine installed on vehicleUse 45 bent blade feeler gauge (Snap-on FB300A) inserted through intake socket of valve coverIf gap is under tolerances, rotary valve cover can be refaced to increase clearanceIf gap is over tolerances, cover replacement may be necessaryCheck if surfaces on crankcase halves are damaged, replacement wear plate is availableSecond Method Remove rotary valve cover and its O-ringUse the following type of solder: rosin core diameter: 0.5 mm (.020 in) electronic application (available at electronic stores) Install short pieces (13 mm (12 in) long) of solder directly on rotary valve, one above and one below rotary valve gearApply grease to hold solder in positionReinstall cover in place WITHOUT its O-ring and torque screws to 20 Nm (15 lbfft)Remove cover then clean and measure compressed solder thickness, it must be within the specified tolerance