NCY CVT Compression Spring 1500 RPM Minarelli Yamaha 50 2T

Tune your CVT's backshifting and eliminate belt slippage with the NCY 1500 RPM Performance Compression Spring (Contra Spring). Engineered for Minarelli 50cc 2-stroke engines, this upgraded clutch torque spring applies increased pressure to the rear pulley sheaves — keeping your drive belt at peak tension during heavy acceleration and uphill loads. ISO 9001 certified, made in Taiwan.

Key Features

• 1500 RPM Spring Rate: Stiffer than stock — raises engagement RPM and holds power band higher before upshifting, ideal for mild-to-moderate 70cc performance builds
• Faster Backshifting: Forces lower gear ratios faster when decelerating into turns or climbing hills for immediate throttle response on corner exit
• Eliminates Belt Slip: Additional side pressure on rear pulley sheaves prevents slippage under higher-horsepower or BBK builds
• Drop-In Fitment: Direct replacement for stock Minarelli / Yamaha 50cc 2T rear clutch torque spring assemblies
• ISO 9001 Certified: Manufactured in Taiwan by NCY to strict quality standards

Specifications

• Spring Rating: 1500 RPM
• Application: Rear Clutch / Torque Driver Assembly
• Engine Type: Minarelli 50cc 2-stroke (horizontal & vertical)
• Engine Codes: 1E40QMB, 1PE40QMB, 3KJ, 4VP, 5AU
• MPN: 660A09JOG15
• Origin: Taiwan (ISO 9001 Certified)

Compatibility

Fits short-case and long-case 2-stroke Minarelli horizontal and vertical engines. Will NOT fit 4-stroke GY6 (139QMB) engines.

This product is intended for off-road/racing use only. Not legal for use in California on pollution-controlled vehicles. Performance upgrades are not covered under warranty.

California Prop 65 Warning: www.p65warnings.ca.gov

• 1500 RPM spring rate — stiffer than stock to raise engagement RPM and hold power band higher before upshifting
• Faster backshifting — forces lower gear ratios faster when decelerating into turns or climbing hills
• Eliminates belt slip — additional side pressure on rear pulley sheaves prevents slippage under higher-horsepower builds
• Drop-in replacement for stock Minarelli / Yamaha 50cc 2T rear clutch torque spring assemblies
• ISO 9001 certified, manufactured in Taiwan by NCY

Spring Rating: 1500 RPM | Application: Rear Clutch / Torque Driver Assembly | Engine: Minarelli 50cc 2-stroke (horizontal & vertical) | Engine Codes: 1E40QMB, 1PE40QMB, 3KJ, 4VP, 5AU | MPN: 660A09JOG15 | Origin: Taiwan

Fits 2-stroke 50cc scooters with Minarelli-style engines (horizontal & vertical, short-case and long-case). Compatible with Yamaha Zuma 50 (2T), Jog 50, Vino 50 (2T), BW's 50; Genuine Buddy 50, Roughhouse 50, Rattler 50; Aprilia SR 50 (Minarelli 2T), Rally 50, Scarabeo 50 (2T); CPI Oliver/Hussar/Aragon 50; Keeway Fact/Matrix/Hurricane 50; Malaguti F12/F15; Adly Bullseye/Jet/Thunderbike 50; Vento Triton/Zip 50. Will NOT fit 4-stroke GY6 (139QMB) engines.