2010 Polaris Sportsman 850 Service Manual, Page 209Get this manual
CLUTCHING (PVT) 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 Remedy -Replace with recommended spring -Install correct shift weight kit to match engine application
Erratic engine operating RPM during acceleration or -Belt worn unevenlythinburnt spots load variations -Driven clutch malfunction
-Driven clutch spring broken or installed in wrong -Replace spring; refer to proper installation location helix location -Drive clutch binding ADisassemble drive clutch; inspect shift weights for wear and free operationBClean and polish stationary shaft hub; reassemble clutch without spring to determine problem area Replace belt Inspect movable sheave for excessive bushing clearance