Ask yourself this question. Why do you tune the CVT, and what are you trying to achieve? The stock rollers give the best performance all around but has it's limits. If you climb steep hills you will want the lighter roller so as to slow the upshift thus keeping the rpm's higher while climbing. Since the GY6 was designed for the much lighter scooter the buggy which is much heavier will need a lighter roller than the scooter. The more power the engine produces the heavier roller you will need as compared to the stock engine. This is why Miamieddie uses lighter roller weights in his heavier Carter than he does in the lighter Baja. I'm running 18g rollers in my single seat Blade and I'll climb almost any hill. The power your engine makes along with the type of riding you do will determine what weight rollers you will use.
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