2004 Ski-Doo REV Series Factory Service Manual, Page 264Get this manual

2004 Ski-Doo REV Series Factory Service Manual, Page 264

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Section 06 TRANSMISSION Subsection 06 (CHAINCASE)
If chain deflection is greater than 38 mm (1.5 in) (without chain tensioner), replace chain and check condition of sprockets
GEAR RATIO MO