1999 Ski-Doo Factory Shop Manual Volume Two, Page 113Get this manual
Subsection 03
Section 04 ENGINE (494, 583 AND 670 ENGINE TYPES)
Install locating sleeveThen push needle bearings along with thrust washers and sleeve
INSPECTION
Refer to ENGINE DIMENSIONS MEASUREMENT 04-04
RAVE System
Check valve rod housing and cylinder for clogged passages
A02C2FA
TYPICAL 1Locating sleeve 2Sleeve
RAVE System
NOTE: RAVE stands for Rotax Adjustable Variable ExhaustRemove spring clip no3, cover no5 and spring no6Cut clamp no8 (remove spring on 494) and unscrew valve piston no7Spread clamp no10 and remove bellows no9Remove cylindrical screws no11 then valve rod housing no13Pull out exhaust valve no16A24C05A
TYPICAL 1Draining hole 2Passages