NCY Idle Screw for CVK Carburetors; GY6, 139QMB

Tool-Free Tuning: NCY Performance Idle Adjustment Screw

Stop fumbling for a screwdriver every time the weather changes. The NCY Idle Adjustment Screw replaces the difficult-to-reach stock screw on your CVK carburetor

Key Features & Benefits

• Superior Vibration Resistance: Includes a high-tension spring designed to hold your settings securely, even on high-vibration GY6 engines.
• Durable Brass Construction: Precision-machined for smooth threading and long-term resistance to fuel and heat corrosion.
• Universal CVK Fitment: Designed specifically for the constant-velocity (CVK) style carburetors found on most modern 4-stroke scooters.

Technical Specifications

• Compatibility: CVK / GY6 Style Carburetors
• Material: Machined Brass
• Spring Included: Yes (High-Tension Steel)
• Installation: Direct replacement for OEM idle screw.

Confirmed Vehicle Fitment

This idle screw fits 50cc to 170cc 4-stroke engines utilizing a CVK carburetor:

Mechanic's Note: When installing, ensure the engine is warm. Screw the new NCY idle screw in until the engine stays running at a steady RPM (typically 1,600–1,900 RPM for GY6). If your bike "dies" at stoplights, this is the quickest fix to keep your engine alive.

SKU: 1300-1003 | Manufacturer: NCY | Part Number: 619N14CVK