100cc 52.4mm Complete Cylinder Kit with 64mm Valves for GY6 50cc 4-Stroke Engines
100cc 52.4mm Complete Cylinder Kit with 64mm Valves for GY6 50cc 4-Stroke Engines 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
Not sure? Text or email a photo of your old part or your engine model number. We'll confirm it fits before you buy.
Delivery and Shipping
Delivery and Shipping
Ships from our Duluth, Georgia warehouse.
Most in-stock orders ship the same business day. UPS orders placed before 3:00 PM ET, USPS orders before 12:00 PM ET. After the cutoff, they go out the next business day.
Standard delivery runs 2 to 6 business days to most US addresses. US territories take 7 to 14. These are carrier estimates, not guarantees.
Free shipping on most parts, no minimum order. Oversized items (body kits, wheels, tires, batteries, and engines) are quoted to your address and shown at checkout before you pay.
We ship UPS and USPS, and email your tracking number as soon as the order leaves.
Questions? Call or text 404-532-9833. Full details on our Shipping page.
100cc 52.4mm Complete Cylinder Kit with 64mm Valves for GY6 50cc 4-...
100cc 52.4mm Complete Cylinder Kit with 64mm Valves for GY6 50cc 4-Stroke Engines is backordered and will ship as soon as it is back in stock.
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.
Payment & Security
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