NCY Performance Secondary Slider Sheave | GY6 161QMK

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:

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

• Aggressively angled slits for smooth CVT belt transitions
• Pre-installed rubber o-rings included
• 141.84mm OD slider plate
• Fits GY6 157QMJ/152QMI 125cc-150cc and most 161QMK 169cc engines
• ISO 9001 certified, Made in Taiwan

Slider Plate OD: 141.84mm | Funnel ID: 34mm | Funnel OD: 43mm | Funnel Height: 47mm | Includes: Pre-installed o-rings | Engine: GY6 157QMJ/152QMI | Origin: Taiwan

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