The NCY Secondary Slider (Sliding Sheave) is a performance rear converter plate for GY6 125cc and 150cc and most 161QMK engines (verify Pulley diameter). Engineered to replace the restrictive stock sheave, this precision-machined component optimizes belt movement across the entire RPM range for faster acceleration, smoother backshifts, and immediate throttle response.
Why Upgrade to a Performance Secondary Slider?
Dual Slot Profiles for Custom Tuning: Features two distinct sets of guide pin tracks (straight and curved) allowing you to fine-tune your RPM torque curve based on your riding style and setup.
Eliminate Belt Hang-Up & Slip: NCY’s precision-machined geometry ensures smooth, predictable belt travel without speed dead-spots or binding.
Optimized Backshifting: Redesigned pin tracks force the transmission into the correct gear ratio instantly for maximum corner-exit acceleration.
Maximum Torque Transfer: Prevents drive belt slippage under heavy load or uphill climbs, delivering more power directly to the rear wheel.
Key Features
Dual Guide Pin Tracks: Two slot angles — choose between rapid linear shift-out or smooth stock-like engagement.
Aggressively Angled Slits: Re-engineered geometry eliminates performance lag and smooths CVT ratio transitions.
Pre-Installed O-Rings: High-temp rubber o-rings fitted at the factory for a clean, drop-in installation.
GY6 Platform Fitment: Tailored for 152QMI and 157QMJ-based 125cc, 150cc, and most 161QMK 169cc “200” engines – verify pulley diameter.
ISO 9001 Certified: Precision manufactured in Taiwan by NCY to rigorous quality control standards.
Technical Specifications
Slider Plate OD: 141.84mm
Funnel ID: 34mm
Funnel OD: 43mm
Funnel Height: 47mm
Includes: Pre-installed rubber o-rings
Manufacturer: NCY (ISO 9001 Certified, Taiwan)
Compatibility
Fits 157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:
157QMJ
Most 161QMK
152QMI
Most 1P61QMK
YN1P57QMJ
1P52FMI
154FMI
JJ157QMJ
1P57QMJ
BN157QMJ
Most BN161QMK-A
Other QMJ, QMK, QMI models
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
