NCY 1000 RPM contra spring (also called a compression or secondary spring) for Yamaha 125cc 4-stroke scooters. Dark-coated high-fatigue silicon-steel construction resists tension loss over time, keeping your CVT settings consistent even after thousands of miles. The 1000 RPM rating delays upshifting slightly longer than stock, keeping the engine in its power band for better hill climbing and mid-range response. Provides faster back-shifting when you get back on the throttle in stop-and-go traffic. Made in Taiwan by NCY. Sliding weights not included.
Key Features:
Specifications:
Compatibility:
Off-road / competition use only. Not intended for use on pollution-controlled vehicles. Check local laws before installing. Not covered under warranty.
