1999 Ski-Doo Factory Shop Manual Volume One, Page 122Get this manual
Section 04 ENGINE Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
4Remove rotary valve cover and check for leak of rotary valve seal with soapy water
COOLING SYSTEM LEAK TEST
Install special plug (radiator cap) (PN 529 021 400) and hose pincher (PN 529 009 900) on overflow hosePressurize all system through coolant reservoir to 15 PSICheck all hoses and cylinderbase for coolant leaksSpray soapwater solution and look for presence of air bubbles