This is a nice list of tips for variator and cluth tuning that was posted by Phazei on the forums

This isn't a direct how to, it's just some general notes on what different things might mean that I've either read somewhere or learned myself. If anyone sees any errors, let me know and I'll fix them.

First pick weights that close the variator. Variator must close while load is on tire, reving on kick stand will tell nothing. To check closure: put a line of white-out on variator ramp before driving, wait for it to dry. It will be eaten away up to where the belt rides up to. Best weights are the lighest weights that will cause the variator to fully close (belt ride to top of ramp). If variator doesn't close you loose top gear and don't get the expected rpm. If variator can't close a super weak torque spring won't even cause it to close.

Clutch should engage before (or close to) the variator starts closing (up gearing). If clutch engages at too high a rpm, scooter might upgear before engagement causing very slow speeds (like starting in 4th gear, scooter might not have enough power to ever accelerate to where it should be in that gear)

Clutch is controlled by a balance of clutch springs and torque spring.
If upgearing occures at a rpm with a good amount of torque, tune the clutch to engage at that rpm by adjusting the clutch springs.
If you want to lower or increase the rpm it engages at, decrease or increase strength of torque spring respectively.

Increasing torque spring to stop it from upgearing to fast (will upgear at higher rpm). If torque spring is to strong, engine won't have power to open clutch and close variator (will never upgear to maximum). Too heavy a torque spring or weights can cause high revs without proper acceleration, decrease one.

If torque spring is too weak, if you have good acceleration to max speed, then slow down, then try to accelerate quickly again, the second acceleration could be very poor. This happens because once you slowed down the scooter didn't down gear since the torque spring was to weak to reclose the clutch when you had slowed down. Stronger torque spring needed.

If clutch engages at too high an rpm, and torque spring too strong, lower both torque spring and engagement.


Some fine tuning at the end, can change weights by around 0.5g either direction:

Lighter weights will raise acceleration and lower top end.
Heavier weights will lower acceleration and raise top end.

Lighter riders might want heavier weights.
Heavier riders might want lighter weights.


Lighter weights will cause transmission to upgear sooner so you would want to lower clutch engagement.

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