Comet 108 4-Pro Clutch2007 Yamaha RS90M RS Vector Mountain219803A

Comet 108 4-Pro clutches now accept OEM starter ringsAdded fourth load-bearing member increases roller and button lifeThese race clutches are for high-performance applications ONLYClutch uses four clutch weights to greatly enhance tuneabilityTo determine arm, add weight of three arms used in 108-EXP, add 14%, then divide by four; this will be the new arm weight to useArms can be used in sets of two to better zero-in on desired weightUses same springs as 102-C and 108-EXP clutchesCaptivated tower allows shouldered cover bolts to virtually eliminate tower spreadingEach features a new bushing in the movable face and redesigned fixed face for increased durabilityIMPORTANT NOTE: These clutches are for racing use only. For calibration, contact a high performance specialist or Comet Industries.