• Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine - goofitmoto
  • Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine - goofitmoto
  • Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine - goofitmoto
  • Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine - goofitmoto
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GOOFIT

Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine

Cylinder Head Assembly with Valves & Springs for 4-Stroke GY6 49cc 50cc 139QMB 139QMA Engine

$38.99
$38.99
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Product Overview

Restore the compression and smooth idling of your 50cc scooter with the GOOFIT Professional Complete Cylinder Head Kit. This high-quality replacement is designed for the 4-stroke GY6 139QMB/139QMA engine platform. Unlike bare heads, this kit comes fully loaded with intake/exhaust valves, springs, and seals already installed (as pictured), providing a direct "bolt-on" solution to fix leaky valves or cracked heads without the need for specialized engine tools.

Product Compatibility

A standard OEM-spec replacement for 4-stroke 49cc/50cc Chinese engines.

Engine Platform Displacement Vehicle Type
GY6 139QMB 49cc / 50cc Gas Scooters, Mopeds
GY6 139QMA 49cc / 50cc ATVs, Quads, Karts
Compatible Brands TaoTao, Peace Sports Wolf, Ice Bear, Bacci

Specifications

Attribute Details
Bore Compatibility Standard 39mm (50cc)
Engine Type 4-Stroke GY6 Air-Cooled
Included Components Cylinder Head, Intake/Exhaust Valves, Springs, Clips, Seals, Studs, Gaskets
Assembly Status Fully Loaded / Pre-Assembled
Spark Plug Type Fits A7TC / C7HSA (Standard)

Key Features

  • Complete "Ready-to-Install" Bundle: This is a fully equipped cylinder head featuring pre-installed valves, heavy-duty springs, and clips, saving you the time and frustration of a manual rebuild.
  • Premium Heat Dissipation: Engineered with a high-efficiency fin structure that rapidly draws heat away from the combustion chamber, ensuring stable performance during long commutes.
  • Industrial-Grade Durability: Cast from high-toughness, corrosion-resistant alloys that are rustproof and designed to withstand the wear and tear of daily street use.
  • Perfect Gas Sealing: Includes high-quality head and base gaskets to provide an airtight seal, restoring lost power and significantly improving fuel efficiency.
  • Meticulous Precision Fit: Every component is built to match original factory specifications, ensuring a seamless installation for TaoTao, Sunshine, and other popular Chinese 50cc brands.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for A standard OEM-spec replacement for 4-stroke 49cc/50cc Chinese engines .; Engine Platform; Displacement; Vehicle Type; GY6 139QMB; 49cc / 50cc; Gas Scooters, Mopeds. Key physical/spec details from the product data include Bore Compatibility: Standard 39mm (50cc), 50cc, 49cc. Use the compatibility table and product photos together before ordering.

Do I need to match the OEM part number?

Yes. If your original part has a stamped OEM or manufacturer number, match that number first before ordering. For this cylinder piston kit, also compare the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. This is especially important for GY6 GY6 models because similar model names can use different parts by year or trim.

What models or situations does this part not fit?

Do not order this cylinder piston kit for machines outside the listed compatibility, or for units with different bore sizes, piston-pin diameters, stroke lengths, stud spacing, or gasket patterns. Do not rely only on the model name or engine size.

What should I check before ordering?

Before ordering, compare your original part with the photos and check the bore diameter, piston-pin size, gasket pattern, stud spacing, engine code, stroke type, and cylinder height. Recheck listed specs such as Bore Compatibility: Standard 39mm (50cc), 50cc, 49cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.