Clutch springs and variator weights to refresh your drive train or tune your engine to your liking!
There are two types of clutch springs, the small pillow springs and the large contra (torque) spring. Both are available in various engagement speeds and are color coded for each speed - generally blue is 1000 RPM, yellow is 1500 RPM, and red is 2000 RPM. The clutch pillow springs alter clutch engagement and disengagement and stiffer springs usually result in quicker take off. The main detriment of higher RPM springs is greater fuel consumption, or in some cases, more sluggish acceleration if too stiff of a spring is installed for your engine's performance level. The contra spring keeps tension on the belt and keeps the transmission in it's current gear longer. There are various factors that go into choosing clutch springs including performance mods present in and on the engine, riding style, rider weight, and more. It takes some trial and error to tune a clutch and it's best to start with lower RPM springs and work up from there.
Variator weights are another tuning point in your transmission. The roller weights in the variator determine how quickly the gear ratio moves from low to high during acceleration and what gear ratio is used at any particular speed. The weights operate by centrifugal force so the faster the variator is spinning, the greater the centrifugal force at play. With heavier weights, the greater that force becomes. So a set of light weights and a slow spinning variator means a lower force and a slower gear change, and a quickly spinning variator and heavy weights means a lot of force and a faster gear change. Variator weights are another component, like clutch springs, that will benefit from some testing and tuning to find the particular weight that works best for your set up. We have standard round type weights and also sliding weights from Dr. Pulley. The unique tear drop shape of the sliding weights can offer better wear characteristics as well as allowing more movement (and in turn an extended gear range) in the drive face of the variator.