2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 748Get this manual
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Section 02 ENGINE Subsection 04 (LUBRICATION SYSTEM)
3 Remove -ring and V-ring from breathe r1I 1'11I 1'(I(I' Cht,
AIR MUST NOT FLOW
If test fails, replace the brea th