Universal Parts Valve Adjustment Screw & Nut Set – GY6 QMB

Description

Keep your GY6 or QMB139 engine running with precise valve clearance using this replacement Rocker Arm Valve Adjustment Screw and Lock Nut Set. A worn or stripped adjustment screw is a common cause of valve noise and poor idle — this direct-fit set of two restores proper valve lash adjustment quickly and affordably.

Key Features

• Set of 2 screws with lock nuts — enough for both intake and exhaust valves
• Fine M5×0.50 thread pitch for precise valve clearance adjustment
• Direct replacement for OEM rocker arm adjuster on QMB139 and GY6 engines
• Compatible with 50cc to 150cc 4-stroke single-cylinder engines

Specifications

• Quantity: Set of 2
• Screw Length: 20mm overall
• Thread Size: M5×0.50
• Application: 50cc-150cc 4-stroke QMB139 / GY6 engines

Compatibility

Fits most 50cc 4-stroke scooters and ATVs using the QMB139 engine platform, including:

Tip: Always check valve clearance with a feeler gauge after adjustment. Intake and exhaust specs vary by engine — consult your service manual.

California Prop 65 Warning: www.p65warnings.ca.gov