2004 Skidoo ZX Series Service Manual, Page 224Get this manual

Section 05 ENGINES (4-TEC) Subsection 01 (TROUBLESHOOTING)
SYMPTOM

ENGINE DOES NOT OFFER MAXIMUM POWER ANDOR DOES NOT REACH MAXIMUM OPERATING RPM
CONDITION

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