If you modified your engine or components on your CVT (Continuously Variable Transmission), you may have come across shredding a drive belt or two.
We have seen hundreds of cases like this.
Top Causes of Drive Belt Failure:
1. Replacing the Drive face with poorly designed Ventilation Fins or with a different pitch than stock.
1. Replacing the Drive face with poorly designed Ventilation Fins or with a different pitch than stock.
2. Poor CVT Case ventilation (Blocked or dirty ventilation ports).
3. Oil and water contamination on inner CVT case and components.
- Check oil seals on the crank side and the gearbox side.
4. Incorrect Drive Belt size per Specification.
- Using shorter belts will wear your main bearings and gearbox bearings faster than normal.
- If you are not sure what size belt your scooter uses, contact Sinful Thredz and they'll help you find the correct size.
5. Substandard Quality Drive Belt.
- We always recommend the silver box Bando with silver print on the belt or the King's Kevlar Belt as recommended by ScootDawg and Stan from the long gone oregonvintage.
To keep components working properly, make sure to use the correct lubricants (Ex. silicone lubricant).
If you wish to accomplish much higher RPM than what your CVT is rated for, make sure to create more ventilation ports to keep the belt from excessive heat damage.
We have seen a lot of people using slightly shorter belts to increase torque. It's a lot of fun at the beginning until you realize that your gear bearings and main bearings wear out much faster.
For optimal CVT tuning, consider torque springs, clutch springs, slider weights and if you know a machinist, have him shave the inner variator pockets to extend the roller weight contact surface.
Remember!: Problems start when you replace vital stock parts with poorly designed aftermarket parts. Most of the time, aftermarket performance parts work as a set with modifications to the stock casing. Please use proper tuning techniques. Don't just listen to the experimental tuner online. You may be doing more damage than good.
Ride safe! Cheers!
