Idle Screw for CVK Carburetors & GY6 50cc (139QMB)

Idle Screw for CVK Carburetors on GY6 50cc Engines

This idle adjustment screw is made for CVK carburetors fitted to many GY6 50cc scooters. Its design lets you tune idle without a screwdriver, so no tools are needed for adjustments. It helps keep engine performance steady as the weather changes. It is one of the simpler GY6 50cc scooter parts to swap yourself at home, helping your scooter run smoothly.

Construction and Features

The screw is built from precision-machined brass, giving it smooth threads and good resistance to fuel and heat. A high-tension spring is included to hold your setting in place, even under the vibration typical of GY6 engines. Together these features help the screw stay reliable and reduce the chance of your adjustment shifting while you ride.

Replacement Guidelines

Swapping out the stock idle screw is simple. This part is a direct replacement for the OEM idle screw, so installation is uncomplicated. Check the engine temperature when you install it: with the engine warm, idle should settle at a steady RPM, usually between 1,600 and 1,900 RPM. Setting idle this way can help prevent the engine from stalling at stoplights.

Specifications

• Material: Machined Brass
• Spring Included: Yes (High-Tension Steel)
• Compatibility: CVK / GY6 Style Carburetors
• OEM Part Number: 139QMB
• Fits: GY6 125cc/150cc and 139QMB 50cc 4-stroke engines with CVK carburetors

Fitment

Fits:

• GY6 125cc / 150cc engines (CVK carburetor)
• Buddy 125/150
• Wolf EX-150
• TaoTao Lancer
• 139QMB / QMB139 engines (CVK carburetor)
• TaoTao Powermax
• Wolf Blaze II

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