Polaris 2001 High-Performance Snowmobile Service Manual (PN 9916690), Page 204Get this manual
CLUTCHING Assembly, ContHelix Angles and Effects
The driven clutch helix was selected for overall performance in relation to the other driven system componentsIn fine tuning situations requiring slight adjustment of engine operating RPM or improved backshift, we recommend trying helix change before changing other components
Helix Ramps