The Dr. Pulley Yamaha Majesty 400 HiT Clutch, 169-379 has 2 sets of springs at work: the clutch spring inside controls the movement of the clutch pads towards the clutch bell through centrifugal power.

The second set of torque springs (pillow springs), externally mounted, controls the pressure by using a push pin on the clutch linings against the clutch bell. This prevents most of the slipping phase of the clutch, thus creating less friction and allowing less heat to be created. Heat is lost power! Therefore your scooter will accelerate much faster due to the power transfer occurring at a lower RPM.

The clutch can be customized for all personal needs. For instance, if you want to get more power at start, choose a stronger clutch spring to increase the starting RPM. If you want to shorten the slipping phase of the clutch, you should use a weaker torque (pillow) spring.

For an extreme start, select a strong clutch spring and a weak (or no) pillow spring.

Benefits:

• Overall Outer Diameter: 157mm
• Center Opening: 33mm (width), 36mm (height)
• 55 Degree Pillow Springs
• Includes Several Sets of Pillow Springs and Clutch Springs for Fine Tuning
• Reduces Clutch Slippage
• Improved Clutch Efficiency