100cc 52.4mm Complete Cylinder Kit with 64mm Valves for QMB139 QMI139 4-Stroke Engines ATV Dirt Bike
100cc 52.4mm Complete Cylinder Kit with 64mm Valves for QMB139 QMI139 4-Stroke Engines ATV Dirt Bike is backordered and will ship as soon as it is back in stock.
Pickup available at 2875 N Berkeley Lake Rd NW #4
Usually ready in 1 hour
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100cc 52.4mm Complete Cylinder Kit with 64mm Valves for QMB139 QMI1...
100cc 52.4mm Complete Cylinder Kit with 64mm Valves for QMB139 QMI139 4-Stroke Engines ATV Dirt Bike is backordered and will ship as soon as it is back in stock.
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Description
Description
- Wide Compatibility: Fits Chinese GY6 scooters, ATVs, dirt bikes, and go-karts with QMB139 / QMI139 engines. Compatible with brands like TaoTao, Jonway, Roketa, Baotian, Baccio, and more—ideal for engine upgrades, replacements, or power rebuilds.
- Complete Kit: Includes 52.4mm cylinder block, pre-installed 64mm valve head, piston, rings, gaskets, and valve rockers, everything needed to rebuild or upgrade your GY6 QMB139 50cc–100cc engine for improved power and long-lasting performance.
- Engine Power: Enhance your scooter or ATV’s torque and top speed with this 100cc big bore kit. Optimized airflow from larger valves ensures better combustion and acceleration, giving your 4-stroke engine a significant performance upgrade on every ride.
- Durable Construction: Made from high-quality materials, this kit resists heat, vibration, and wear. Intake bolt spacing is 44.75mm, exhaust is 49.75mm—designed to OEM specs for a secure and precise fit on QMB139 / QMI139 4-stroke Chinese engine types.
- Easy Installation: Cylinder head features 64mm valves already installed, saving time and effort. Intake (18mm) and exhaust (16mm) valves offer better airflow and efficiency, perfect for performance builds, upgrades, or replacements for worn-out parts.
- 1x Cylinder Block
- 1x Cylinder Head (with 64mm valves pre-installed)
- 1x Piston
- 1x Piston Pin
- 2x Circlips
- 5x Piston Rings (Full Set)
- 5x Valve Rockers/Rollers
- 1x Cylinder Head Gasket
- 1x Cylinder Base Gasket
- 1x Intake Gasket
- 64mm Valves
- Intake Bolt Hole Spacing: 44.75mm
- Exhaust Bolt Hole Spacing: 49.75mm
- Intake Valve Diameter: 18mm
- Exhaust Valve Diameter: 16mm
- Upgraded 100cc Cylinder Head & Valve Assembly QMB139 / QMI139 4-Stroke Engines.
- Exact replacement part for many Chinese-manufactured brands and models of Chinese Mopeds and Scooters.
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