Upgrade the CVT performance of your GY6 50cc 4-stroke scooter with the Naraku Performance Variator Kit. Designed for the QMB139 / 139QMB engine platform, this complete kit includes the CNC-machined, PTFE-coated variator drive face, coated movable face with red slider guides, 6 roller weights, bronze bushing, and steel boss sleeve — everything needed for a direct bolt-on variator replacement or performance upgrade.
Model Compatibility
- Genuine Buddy 50
- Genuine RoughHouse 50
- Honda Ruckus (NPS50)
- KYMCO Agility 50, Vitality 50, Filly 50
- SYM Mio 50
- QMB139 / 139QMB 50cc / 49cc 4-stroke engines (various makes)
Features
-
PTFE-Coated Drive Face: Inner variator surface features PTFE coating to prevent galling, reduce friction, and extend belt and roller life.
-
Complete Kit: PTFE-coated variator drive face, CNC movable face with red slider guides, 6 roller weights, bronze bushing, and steel boss sleeve.
-
Movable Face: Black-coated aluminum with NARAKU PERFORMANCE engraving and red slider guides for smooth, consistent belt engagement.
-
88mm Outer Diameter: Correct sizing for QMB139 short-case 50cc CVT systems.
-
6g Roller Weights: 16x13mm rollers for an optimized CVT shift curve on stock and mildly tuned 50cc engines.
Specifications
- Variator Outer Diameter: 88mm
- Drive Face Coating: PTFE (inner surface)
- Roller Weight Size: 16 x 13mm
- Roller Weight: 6 grams (set of 6)
- Includes: PTFE-coated variator drive face, movable face, 6 roller weights, bronze bushing, steel boss sleeve
- Engine: QMB139 / 139QMB 50cc 4-stroke
California Prop 65 Warning: www.p65warnings.ca.gov
Model Fitment
Genuine Buddy 50, Genuine RoughHouse 50, Honda Ruckus NPS50, KYMCO Agility 50, KYMCO Vitality 50, KYMCO Filly 50, SYM Mio 50, and other QMB139 / 139QMB 50cc 4-stroke scooters
