Variable Pressure Clutch
http://www.harley-davidson.com/store/se-variable-pressure-clutch ประมาณนี้ครับ
Clutch kit harnesses the centrifugal force of spinning weights to increase the clutch capacity as engine speed increases.
-Mechanism applies increasing pressure to the stock clutch pressure plate as RPM rises
-High torque-handling capabilities without increasing clutch lever effort at idle
-Variable pressure clutch also provides smoother clutch disengagement at lower speed
-Kit fits behind most stock derby covers with no modifications
-See installation manual for additional accessory derby cover fitment information