1997 Ski-Doo Factory Shop Manual Volume One, Page 27Get this manual
Section 02 TROUBLESHOOTING Sub-Section 02 (ENGINE)
SYMPTOM CONDITION TestInspection
ENGINE EQUIPPED WITH "RAVE"ENGINE HESITATES AT MID-SPEED AND REACHES MAXIMUM PERFORMANCE ONLY AFTER WHILENORMAL USE1Check "RAVE" valve spring(s)aSpring tension is too weak or spring(s) is (are) brokenReplace2Check "RAVE" valve cover red adjustment screwsaAdjustment screw(s) is (are) too looseFully tighten3Check "RAVE" valve movement ("RAVE" movement indicator PN 861 7258 00)aValve(s) is (are) stuck in open positionClean