Pay in 4 interest-free payments of $5.50 Learn more
Ships within 48 hours · Estimated delivery Aug 30 - Sep 4
Thread Diameter: M8 (8mm)
best selling scooter models
Designed specifically for the GY6 139QMB engine platform
OEM belt fits the following models: Kymco ZX50
Reduced Friction: The polished internal bore provides a much smoother "snap-back" feel compared to textured plastic tubes
NCY Ball-Bearing Secondary Spring Seat | GY6 & QMK 125-170cc stators Thread Diameter: M8 (8mm)The NCY ball bearing secondary spring seat eliminates CVT spring twist and binding on GY6 125 150 170cc engines. In a stock setup, the torque spring must twist as it compresses, creating internal friction that slows downshifts and reduces belt life. This NCY upgrade uses an integrated ball bearing assembly that allows the spring to rotate freely during compression and decompression, resulting in faster, more consistent CVT response. Zinc plated steel
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