Smooth Shifting: NCY Ball-Bearing Secondary Spring Seat

Eliminate CVT binding and "spring twist" with the NCY Secondary Spring Seat. In a stock GY6 setup, the torque spring must twist as it compresses, creating internal friction that slows down your transmission's response. This NCY upgrade features an integrated ball-bearing assembly that allows the spring to rotate freely, ensuring lightning-fast downshifts and much smoother overall belt operation.

Technical Performance Features

• Anti-Binding Technology: The bearing seat allows the secondary spring to decompress without torsional resistance, providing consistent "pop" and more responsive acceleration.
• Reduced Belt Heat: By smoothing out the opening and closing of the rear pulley, this seat helps reduce parasitic drag and excessive heat buildup in the CVT belt.
• Hardened Steel Construction: Engineered to withstand the high-RPM environment of performance GY6 builds, ensuring the bearings stay seated even under extreme spring tension.
• Improved Downshifting: Noticeably improves the scooter's ability to "find the right gear" when coming out of corners or hitting inclines.

Comprehensive Fitment Guide

This seat is designed for GY6-based 125cc to 170cc engines and is a direct-fit performance upgrade for:

157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:

Don't see your engine listed? If the engine is 125-200cc and the engine code includes "QM" or "FM", this product is compatible with your vehicle.

Technical Specifications

• Bearing Seat ID: 45.4mm
• Bearing Seat OD: 57.5mm
• Groove Width: 1.75mm
• Included Hardware: High-tension bearings and bearing seat