2005 Ski-Doo Racing Handbook, Page 390Get this manual

2005 Ski-Doo Racing Handbook, Page 390

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SECTION 082005 MX 550 AND 380 FC
Belt deflection must be according to the following specifications:
ENGINE TYPE 377 and 552 BELT DEFLECTION 9.5 mm (38 in) FORCE APPLIED kg (11 lb)