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Tune your GY6 50cc scooter with these performance variator rollers from fellerssmallengines.
They're 16x13mm and weigh 9 grams each—a full set.

Made for 139QMB engines and similar.

Swapping rollers changes how your scooter accelerates; 9g is a good all-around weight.

Brand new in packaging.

Note: California Prop 65 warning applies.

If you want to dial in your CVT tuning, grab these rollers and experiment.
No UPC, but performance gains are real.

4.6 out of 5