# Variator

> A variator is the pulley system in scooters and other CVT motorcycles that changes the drive ratio steplessly according to engine speed.

- **Also known as:** Ön varyatör, Arka varyatör, Variator, Kasnak
- **Turkish term:** Varyatör
- **Category:** [Front Variators](https://motorsikletparcasi.com/en/category/front-variators)
- **Page:** https://motorsikletparcasi.com/en/glossary/variator

A variator consists of two pulleys. The **front variator** sits on the crankshaft; as revs rise, the [variator rollers](https://motorsikletparcasi.com/en/glossary/variator-rollers) move outwards under centrifugal force, push the pulley halves together and make the belt run on a larger diameter. The **rear pulley** uses a spring and a torque cam to pull the belt to a smaller diameter. The ratio is therefore short when pulling away and gets taller as speed builds.

The system works together with the [drive belt](https://motorsikletparcasi.com/en/glossary/cvt-drive-belt) and the [centrifugal clutch](https://motorsikletparcasi.com/en/glossary/centrifugal-clutch).

## Symptoms of a problem

- Hesitation or sudden rev flares when accelerating
- Lower top speed and weaker pull
- Knocking or whining from the variator cover

These are usually caused by worn rollers and sliders or a worn belt, so the parts should be inspected together.

## Related terms

- [Variator rollers](https://motorsikletparcasi.com/en/glossary/variator-rollers): Variator rollers are cylindrical weights in the front variator that move outwards under centrifugal force and increase the belt's running diameter.
- [CVT drive belt](https://motorsikletparcasi.com/en/glossary/cvt-drive-belt): A CVT drive belt is the V-section, cogged rubber belt that carries power between the front and rear variator pulleys of a scooter.
- [CVT (continuously variable transmission)](https://motorsikletparcasi.com/en/glossary/cvt): A CVT is the automatic transmission used in scooters that varies the drive ratio continuously with variator pulleys and a belt, without fixed gears.
- [Centrifugal clutch](https://motorsikletparcasi.com/en/glossary/centrifugal-clutch): A centrifugal clutch is the automatic clutch in scooters whose shoes swing out under centrifugal force as revs rise and grip the clutch bell to drive the wheel.

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- Source page: https://motorsikletparcasi.com/en/glossary/variator
- Last updated: 2026-10-09
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