GY6 Performance Torque Springs 

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monsterGY6 Torque Springs
50cc - 125cc - 150cc
$15.00
The torque spring is the main spring that is located behind the clutch pulley. Each color represents the stiffness of the spring and is defines as follows:
blue = 1000rpm
yellow = 1500rpm
red = 2000rpm
The stiffer the spring, the quicker the throttle response will be at take off, if you upgrade to the performance clutch, the yellow spring is recommended.
You will be given the option to order for 50cc, 125cc or 150cc once you click the add to cart button.