2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 256Get this manual

CLUTCHING TROUBLESHOOTING
Situation
Engine RPM below specified operating range, although engine is properly tuned
Probable Cause
-Wrong or broken drive clutch spring-Drive clutch shift weight too heavy

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