100cc Head Assembly, 64mm, for Scooter Big Bore Kits
100cc Head Assembly, 64mm, for Scooter Big Bore Kits 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 Head Assembly, 64mm, for Scooter Big Bore Kits
100cc Head Assembly, 64mm, for Scooter Big Bore Kits is backordered and will ship as soon as it is back in stock.
Description
Description
- Perfect Fit: Outfitted with oversized 64mm valves, 18mm intake and 16mm exhaust, this cylinder head allows superior air/fuel intake and exhaust flow. The enhanced combustion efficiency translates to smoother throttle response, more complete fuel burn, and improved fuel economy, even while delivering enhanced power output.
- Wide Compatibility: Compatible with a wide variety of Chinese-manufactured 50cc to 100cc mopeds and scooters, including brands like TaoTao, Jonway, Peace Sports, and more. Whether you're upgrading an old ride or building a custom scooter, this performance cylinder head ensures a reliable fit and optimized performance across the board.
- Massive Power: Experience an instant surge in engine performance with this 100cc Big Bore Kit. Designed to significantly increase displacement from standard 50cc/80cc engines, this kit provides a dramatic improvement in torque and horsepower, allowing faster acceleration and a noticeable boost in top-end speed for GY6 139QMB scooters.
- Durable Construction: Manufactured with premium-grade materials, this cylinder head and valve assembly ensures long-lasting durability under high-heat and high-RPM conditions. The robust build quality is ideal for performance riders, daily commuters, and anyone looking for a reliable upgrade that can withstand extended use without compromise.
- Easy Installation: This big bore kit is designed as a direct bolt-on replacement for QMB139/QMI139 4-stroke engines with compatible intake (44.75mm) and exhaust (49.75mm) bolt hole spacing. Its user-friendly design makes installation straightforward for DIY users and professionals alike, no complex modifications required.
- 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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