2001 Ski-Doo Factory Shop Manual Volume Two, Page 128Get this manual

2001 Ski-Doo Factory Shop Manual Volume Two, Page 128

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Section 04 ENGINE Subsection 05 (OIL INJECTION SYSTEM)
4, Check Valve
A06C3KB

TYPICAL ENGINE AT IDLE 1 Oil columns advancing 2 Fully open position

If not, remove