i believe the most common problems with the gy6 CVT are
the constant movement of the belt
(the clutch is on the wrong end)
and gearbox final drive
( each gear interaction cost a few percent efficiency)
I would move the clutch to the drive pulley like a comet.
A giant 17 inch serpentine pulley on the back wheel and a 2 inch
pulley on a real swing arm axle jackshaft
it would weigh less handle bumps better
and be more effective
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