Polini Variator Rollers - 20X17 - 17.0 Grams
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Product Information
Full details
The Polini 20X17 17.0g variator rollers are designed for scooter enthusiasts and mechanics seeking to fine-tune transmission performance for improved acceleration and consistent power delivery. These high-precision components are ideal for riders who need a reliable replacement for worn-out rollers or wish to optimize their variator setup for a smoother ride, though users must ensure 17.0g is the correct weight for their specific engine tune to avoid performance drops.
All features
| Model Part Number | 242.356 |
|---|---|
| Brand | Polini |
Extended Product Information
FAQs
How do I know if 17.0g is the right weight for my scooter?
The ideal weight depends on your engine's power curve and personal preference. If you are unsure, check your stock roller weight and adjust based on whether you want more acceleration (lighter) or better top-end speed (heavier).
Can I mix these with other weights?
It is strongly recommended to use all six rollers of the same weight to ensure even distribution and prevent uneven wear on your variator plates.
Are these rollers compatible with all scooters?
No, these are 20X17mm rollers. You must confirm that your specific scooter's variator uses the 20X17mm size before purchasing.
Do I need special tools to install these?
Yes, you generally need a variator locking tool and a socket wrench set to safely remove the variator assembly without damaging the crankshaft.
What is the lifespan of these rollers?
Longevity depends on riding style and engine modifications, but they should be inspected for flat spots every 3,000 to 5,000 kilometers.
Troubleshooting
Engine revs too high but bike moves slowly
The rollers might be too light for your setup; consider testing a heavier weight.
Engine sluggish when accelerating from a stop
The rollers might be too heavy; consider testing a lighter weight or check for debris in the variator ramps.
Excessive noise from the transmission
Ensure the rollers are installed correctly in the ramp guides and the variator nut is torqued to manufacturer specifications.
Pros and Cons
Pros
- Improved throttle response for quicker take-offs
- High-precision manufacturing ensures consistent performance
- Reduces transmission vibration for a smoother ride
- Ideal for both maintenance and performance tuning
Cons
- Incorrect weight selection can negatively impact top speed or acceleration
- Requires transmission disassembly for installation
- Weight is fixed; tuning requires purchasing different sets if 17g is not optimal
Setup, Compatibility & Care
Installation requires removing the transmission cover and using a variator locking tool to secure the pulley while loosening the center nut. It is critical to ensure the rollers are placed in the variator ramps with the correct orientation; usually, the side with the closed plastic wall should face the direction of rotation to prevent premature wear. When installing, apply a very light coat of high-temperature transmission grease only if specifically recommended by the scooter manufacturer, though many modern Polini rollers are designed to run dry. Always check for flat spots on your old rollers during replacement, as these indicate it is time for a service. Regularly inspect the variator ramps for scoring or debris during your maintenance intervals.