1989 Ski-Doo Repair Manual, Page 183Get this manual

Section 02 ENGINE SUbs8ction 07 (683 ENG INE TYPE)
RAVE SYSTEM TROUBLE SHOOTING
SYMPTOM
Engine revs 500 to 1000 RPM lower than its maximum operational RPM

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives