UMA Racing Torque Spring 1500 RPM Purple for Yamaha Aerox 155 – 02T00680

The UMA Racing Torque Spring 1500 RPM (02T00680), distinguished by its Purple color coding, is a high-tension CVT upgrade designed for the Yamaha NMAX, NVX, and Aerox 155.

While the 1000 RPM (Red) version is suited for mild street use, the 1500 RPM Purple spring is engineered for high-performance setups, providing the aggressive belt tension needed for bored-out engines or riders prioritizing maximum "off-the-line" snap.

Key Performance Benefits

• Maximum Acceleration: By holding the CVT in a lower gear ratio for longer, it allows the engine to reach its peak powerband quickly, resulting in significantly faster 0–60 km/h times.

• Eliminates Belt Slip: The 1500 RPM tension provides a firmer grip on the CVT belt, which is critical for high-torque engines (183cc+ builds) to prevent power loss through friction.

• Rapid Downshifting: When decelerating or entering a corner, this spring allows the transmission to "kick down" instantly, ensuring you have immediate power the moment you twist the throttle again.

• Heat & Fatigue Resistance: Made from high-fatigue resistant steel, it maintains its tension rating even under the extreme heat generated during racing or long-distance high-speed touring.

Technical Specifications

Recommended Product

The UMA Racing Torque Spring 1500 RPM (02T00680) is the primary choice for performance-oriented Yamaha scooters.

Tuning & Installation Note

• Roller Weight Pairing: Because this spring is very stiff, it is often paired with slightly heavier roller weights (e.g., 12g–14g) to prevent the engine from over-revving too early.

• Installation: Requires a CVT clutch compressor tool. Due to the high tension of the 1500 RPM spring, use extreme caution when removing the clutch nut to avoid injury.

• Best For: Riders with modified engines (Bore-up kits) or those who frequently ride in hilly terrain where high-climbing torque is essential.