• 39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV - goofitmoto
  • 39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV - goofitmoto
  • 39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV - goofitmoto
  • 39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV - goofitmoto
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39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV

39mm Cylinder Head with 64mm Valves for GY6 50cc 139QMB 4-Stroke Scooter ATV

$37.99
$37.99
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Product Overview

Upgrade or repair your engine with this high-performance 39mm Cylinder Head, specifically designed for 4-stroke GY6 49cc/50cc engines. Featuring pre-installed 64mm valves, this head is engineered for optimal heat dissipation and long-term durability. It is a direct replacement part designed to restore compression and reliability to your scooter, moped, or ATV.

Product Compatibility

This cylinder head is compatible with the 139QMB / 139QMA engine platform, found in a wide variety of Chinese-manufactured scooters and ATVs.

Vehicle Type Popular Compatible Brands/Models
Scooter / Moped TaoTao (VIP, Pony), Peace Sports, Ice Bear, Wolf, Bintelli, Kymco Agility 50
ATV / Quads Buyang, Coolsport, Kazuma, Sunl, Roketa
Engine Brands Zongshen, Lifan, Loncin, Jianshe

Note: Specifically fits engines using 64mm length valves. Does not fit "Tall Head" versions (69mm valves).

Specifications

Feature Measurement
Cylinder Bore 39mm
Valve Length 64mm (Standard)
Intake Valve Diameter 18.6mm
Exhaust Valve Diameter 16.0mm
Mounting Hole Distance 50mm (Center to Center)
Engine Cycle 4-Stroke

Key Features

  • Precision Fit: Engineered specifically for 139QMB/139QMA engines with 50mm mounting spacing.
  • Superior Cooling: Advanced heat dissipation fins prevent overheating during extended rides.
  • Ready to Install: Comes with 64mm intake and exhaust valves pre-seated for convenient replacement.
  • Enhanced Durability: Built from high-toughness, corrosion-resistant alloy to withstand high combustion pressures.
  • Reliable Performance: Meets or exceeds OEM standards to ensure smooth idling and consistent power delivery.
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Fitment FAQ

Will this part fit my specific model and year?

This cylinder piston kit is intended for This cylinder head is compatible with the 139QMB / 139QMA engine platform , found in a wide variety of Chinese-manufactured scooters and ATVs.; Vehicle Type; Popular Compatible Brands/Models; Scooter / Moped; TaoTao (VIP, Pony), Peace Sports, Ice Bear, Wolf, Bintelli, Kymco Agility 50; ATV / Quads; Buyang, Coolsport, Kazuma, Sunl, Roketa. Key physical/spec details from the product data include Note: Specifically fits engines using 64mm length valves . Does not fit "Tall Head" versions (69mm valves)., Cylinder Bore: 39mm, Valve Length: 64mm (Standard). 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/Roketa/TaoTao 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 Note: Specifically fits engines using 64mm length valves . Does not fit "Tall Head" versions (69mm valves)., Cylinder Bore: 39mm, Valve Length: 64mm (Standard). If any connector, mounting point, size, or year detail is different, confirm fitment before installation.