I work on Motorcycles on a daily basis, a Variator a clutch from a scooter 50cc would probably be more effective since the belt and gearing will always change and be in the right gear for the most efficient use of power. You can experiment with different weight rollers for a faster bite or higher rpm. The V belt is designed to slip and won't wear or break with sudden impacts and will instantly revert back to the best gearing to get going again. overall weight is about 3kg.