NCY Air/Fuel Adjusting Screw - CVK Carb GY6 125/150cc

NCY replacement air/fuel ratio adjusting screw (mixture screw) for CVK-style carburetors on GY6 125cc and 150cc 4-stroke scooters. The factory D-screw requires a proprietary tool to adjust — this NCY screw features a standard flat-head slot so you can fine-tune your idle mixture with a regular screwdriver. Brass body for precise metering. Includes return spring, aluminum washer, and black O-ring. Made in Taiwan by NCY (Chian-Yie Industrial).

Key Features:

• Standard flat-head slot — adjustable with any flat-head screwdriver, no proprietary D-screw tool needed
• Brass body for corrosion resistance and precise fuel metering
• Complete kit: includes adjusting screw, return spring, aluminum washer, and black O-ring
• Direct replacement for CVK carburetor mixture screws on GY6 157QMJ / 152QMI engines
• Made in Taiwan by NCY Motor Sports (Chian-Yie Industrial Co., Ltd.)

Specifications:

• Brand: NCY Motor Sports
• SKU / MPN: 1300-1001 / 619N15CVK
• Application: Air/fuel ratio (mixture) adjusting screw
• Fits: CVK-style carburetors on GY6 125/150cc engines
• Includes: Brass screw, return spring, aluminum washer, O-ring
• Made in Taiwan

Compatibility: Fits any GY6 157QMJ- or 152QMI-based 125cc–150cc scooter equipped with a CVK-style slide-vacuum carburetor. Verify your carburetor type before ordering — not for PZ or PE-style carbs.

Tuning tip: Start at 2.5 turns out from lightly seated. Adjust in 1/4-turn increments at warm idle for best throttle response. Richer (more turns out) for lean stumble; leaner (fewer turns out) for a rich roll-on bog.

Off-road use only. Not intended for use on public roads or land.

• Standard flat-head slot — adjustable with any screwdriver, no proprietary D-screw tool required
• Brass body for corrosion resistance and precise idle mixture metering
• Complete kit: brass screw, return spring, aluminum washer, and black O-ring included
• Direct fit for CVK-style carburetors on GY6 157QMJ / 152QMI 125–150cc engines
• SKU: 1300-1001 | MPN: 619N15CVK | Made in Taiwan by NCY Motor Sports

Brand: NCY Motor Sports | SKU: 1300-1001 | MPN: 619N15CVK | Application: Air/fuel ratio mixture screw | Carb type: CVK slide-vacuum | Fits: GY6 125/150cc (157QMJ / 152QMI) | Includes: Brass screw, spring, washer, O-ring | Origin: Taiwan

Any GY6 157QMJ or 152QMI 125cc–150cc scooter with CVK-style slide-vacuum carburetor. Not compatible with PZ or PE-style carbs. Verify carburetor type before ordering.