Table of Contents

How to tune HiT Clutch

Basic

Conventional Clutch —–

The grip force comes only from the centrifugal force and the friction coefficient of the wear pad on the clutch weight.

HiT clutch —–

The grip force comes not only from the centrifugal force and the friction coefficient of clutch weight, but most importantly from the compression mechanism—push pin & pillow system of HiT Clutch

Benefits of HiT Clutch

Grip force much stronger
Clutch slippage much less
Stop losing power at takeoff
and re-acceleration
Transmission efficiency of
clutch system much improved
Excellent throttle response
Excellent capability of hillclimbing,
roundabout and overtaking

Tuning HiT Clutch

The unique mechanism of HiT Clutch can provide solid engagement to upgrade the acceleration and riding performance of the vehicle.

Various combinations of actuation timing of HiT clutch, performance of engine and CVT transmission may result in different behaviors of vehicle as the following:

Very powerful at takeoff to jump into the air.
Solid engaged to have powerful takeoff and comfort riding.
Solid engaged to have powerful takeoff but having vibration at takeoff.
Solid engaged but upgrade not obvious.

The pillow springs and clutch springs originally installed in HiT clutch are optimum to upgrade the vehicle to enable powerful takeoff and comfortable riding. When the tuning of HiT is required, first select the clutch spring and then secondly determine your preferred pillow spring by testing different pillow springs with the selected clutch spring.

Troubleshooting

Problems		Possible Causes	Suggested Solutions
1.	Powerful takeoff but unable to jump into the air.*	Engine power too weak.	Tune the cylinder.
		Actuation timing too late.	Replace with softer Pillow Spring or use no Pillow Spring.
		Engaged rev too low.	Replace with harder Clutch Spring.
2.	Powerful takeoff but no riding comfort.	Actuation timing too early.	Replace with harder Pillow Spring.
2.	Powerful takeoff but no riding comfort.	Engaged rev too high.	Replace with softer Clutch Spring.
3.	Powerful takeoff but having vibration at initial stage.	Actuation timing too early.	Replace with harder Pillow Spring.
3.	Powerful takeoff but having vibration at initial stage.	Engaged rev too low.	Replace with harder Clutch Spring.
4.	Smooth takeoff but solid engagement not obvious	Belt slippage** happened in the front driving pulley.	Replace with heavier roller.
		Belt slippage happened in the rear driven pulley	Replace with harder torque spring.
		Belt slippage happened in the pulley	Replace with a new belt.

* It’s dangerous to actuate the throttle fully and suddenly when softer pillow spring and harder clutch spring are used at the same time, as the vehicle might jump into the air abruptly to cause serious damage or injury.

** The belt slippage can happen in the pulley due to the solid engagement and less slippage with the clutch bell. The abnormal surface temperature of pulley can be taken as checkpoint to see whether the belt slippage exists.

WARNING

Performance parts are not road legal!! and are designed for close circuit, off-road or exhibition use only. Improper installation can result in serious injury. Purchasers are responsible for all foreseeable or unforeseeable consequences of using any performance parts.

Road test

More Information

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