I put a shim in my variator to increase take off and top speed is the same.
The shim is from the old gy6 valve spring, it is .75mm and put the belt deeper in the variator to help take off power after going back to the 31t sprocket.
It is all about tuning to your riding terrain.
I am happy with the 31t rear sprocket, because now I can tune the variator to the type of riding we do. The 39t killed the top speed and was boring while cruising.
It is all give and take with a 10hp motor, but worth it.
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