Naraku Performance Variator Kit | 139QMB GY6 50cc 4-Stroke

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)

Key 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.

Technical 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

• PTFE-coated variator drive face — prevents galling and extends belt and roller life
• Complete kit: PTFE-coated drive face, CNC movable face, 6 roller weights, bronze bushing, and boss sleeve
• CNC black anodized movable face with red slider guides for smooth belt engagement
• 88mm outer diameter — correct for QMB139 short-case 50cc CVT
• 6g 16x13mm roller weights for optimized shift curve on stock and mild builds

Variator OD: 88mm | Drive Face Coating: PTFE (inner surface) | Roller Size: 16x13mm | Roller Weight: 6g (x6) | Includes: PTFE-coated drive face, movable face, 6 rollers, bronze bushing, boss sleeve | Engine: QMB139 / 139QMB 50cc 4T

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