NCY 1000 RPM (Blue) Contra Spring – Yamaha Zuma / Vino 125

Optimize Your CVT: NCY 1000 RPM Performance Compression Spring

Tame your transmission and improve belt grip with the NCY 1000 RPM Compression Spring (also known as a "Contra" or "Secondary" spring). Specifically engineered for the Yamaha 125cc drivetrain, this 1000 RPM (Blue) spring is the ideal choice for riders seeking a balance between daily drivability and improved back-shifting. It provides just enough extra tension to prevent belt slip without forcing the engine into excessively high RPMs during cruising.

The NCY Performance Advantage

• 1000 RPM (Blue) Rating: Designed to delay the upshift slightly longer than a stock spring, keeping your engine in its power band for better hill climbing and mid-range "punch."
• High-Fatigue Silicon-Steel: Manufactured in Taiwan to resist "spring sack" (tension loss over time), ensuring your CVT settings stay consistent even after thousands of miles.
• Heat-Resistant Coating: The signature Blue powder coating isn't just for looks—it helps dissipate heat and prevents corrosion in the high-friction environment of the rear pulley.
• Improved Back-Shifting: Provides faster "downshifts" when you let off the throttle and get back on it, making your scooter feel more responsive in stop-and-go traffic.

Comprehensive Fitment Guide

This spring (SKU: 1200-1003) is a precision fit for Yamaha 125cc 4-stroke models:

Technical Specifications

• Spring Length: 116mm
• Inner Diameter: 54.5mm
• Wire Diameter: 5.0mm
• RPM Rating: 1000 RPM (Blue)
• Manufacturer: NCY Taiwan

Tuner's Note: When installing a stiffer compression spring, you may need to use slightly lighter roller weights to maintain your target RPM. This "Blue" spring is often paired with 10g or 11g weights for the best all-around performance on a Zuma 125.

Note: Does not fit the 2022+ liquid-cooled Zuma 125 or standard GY6 150cc engines. For those models, please see our GY6-specific NCY springs.