Top 10 GY6 Big Bore Kit – Powersports Cylinder Heads

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61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad, GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit

TRKIMAL #ad - Cylinder bore:upgrade from 57. 4mm to 61mm, Cylinder kits with more power. Apply to: gy6 4 stroke 125cc/150cc engine for most of chinese scooter, atv and go karts. Parts included:gy6 180cc cylinder head comp with valves, Rings and Wrist Pin, Piston, 61mm Bore Cylinder Block, Set of 61mm Piston Assy, Gaskets. Package in cludedCylinder head sets and cylinder kits. Full sets of parts: complete parts is suitable for motorcycle maintenance shop, motorcycle parts supermarket and personal use with nice price.
BrandTRKIMAL #ad
ManufacturerTrkimal #ad
Part NumberAB5894

2. Glixal


Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV

Glixal #ad - 3. Outer diameter of Piston Pin: 15mm. 5. Include cylinder, piston ring, piston pin, piston, Piston Pin Clip, tensioner gasket, gaskets, Valve Oil Seal, Intake&Exhaust Studs, Exhaust Gasket, Exhaust Nut. 1. Please note: 61mm bore cylinder May Require to Machine the Crankcase on Some Engine Models. 4. Inner diameter: 61mm and Outer Diameter: 65mm. 2. This cylinder fits the 76mm bolt Pattern Engine, It will not work on the 80mm Bolt Pattern.
BrandGlixal #ad
ManufacturerAT MOTOR PARTS #ad
Weight3.57 Pounds
Part NumberATMT1-023



61MM 170-180CC Big Bore Piston Cylinder Kit For GY6 125cc 150cc Scooter ATV & Quad

HYYKJ-US #ad - Specificationdiameter of the kitmm: 61; diameter of piston pinmm: 15; diaplacement: 170cc~180cc; outer diamter of Cylinder Skirtmm: 65; Middle Height of Cylindermm: 69; Total Height of Cylindermm: 90; Total Height of Pistonmm : 38.

5; compression Height of Pistonmm: 20 For displacementinclude jog 50, 100, 70, cn/cf 250, gy6 50, 60, 80, 125, 90, 100, 150, YP VOG 250 260 300. Package includes1*big bore Cylinder Kit inclued Camshaft and Cylinder Head, Gaskets. Noteinstruction not included, professional installation is always recommended. Premium materialthis cylinder kit is made of high quality metal, 100% new high quality, can replace the original correctly, durable.
BrandHYYKJ-US #ad
ManufacturerChoicestEquip #ad
Part NumberAC-5111-ZJW-CE



GY6 Cylinder Rebuild Kits Trkimal 100cc Big Bore Kit for 64mm Valve 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrade Set with 6pin Racing CDI Ignition Coil Performance Spark Plug Clutch Spring

TRKIMAL #ad - Easy Installation. Upgrades parts kits for most of 50cc scooter. This big cylinder kit will upgrade your gy6 50cc 60cc 80cc to 100cc, more power, without EGR, to get more RPM, faster maximum speed. Upgrade engine parts included cylinder body kits, cylinder head kits, copper roller sets, camshaft seat kits, gaskets kits, oil pump and gear, 6pins racing AC CDI, clutch spring sets, camshaft, ignition coil and racing 3-electrode spark plug. 64mm valve length version.
BrandTRKIMAL #ad
ManufacturerTRKIMAL #ad
Weight6.6 Pounds
Part NumberTRKIMAL-001

5. Glixal


Glixal ATMT1-011 139QMB 139QMA Scooter Big Bore Cylinder Kit Rebuild Kit GY6 100cc 50mm Moped ATV Go-Kart

Glixal #ad - 5. High performance upgrade 50mm cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc 100cc engine. 1. Please note this kit is only used for GY6 139QMB 4-Stroke Engine. 2. Inner diameter of Cylinder: 50mm. 4. Include cylinder, piston pin, valve oil seal, gaskets, Intake&Exhaust Studs, Piston Pin Clip, Piston Ring, exhaust gasket, Tensioner Gasket, Piston, Exhaust Nut.3. Outer diameter of Piston Pin: 13mm.
BrandGlixal #ad
ManufacturerAT MOTOR PARTS #ad
Part NumberATMT1-011

6. hongyu


Hongyu 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped

hongyu #ad - For your quick use of new accessories, please consult the picture information and product description before purchasing. Fit gy6 50cc to 100cc 139qa 139QMB Engine. Head valve length 69mm, not 64mm. Cylinder bore Diameter : 50mm. Kit includes: cylinder head, exhaust pipe screw, intake pipe screw, cylinder block assembly, exhaust pipe nut, exhaust pipe gasket four locating pins.
Brandhongyu #ad
ManufacturerHY #ad
Part Number50



50mm Cylinder Block, RUTU 69mm Valve GY6 Big Bore Kit 100cc,with 6pin Racing CDI Ignition Coil,Compatible with Big Bore Kit for 49cc, Boosts HP & Speed 5-10mph, 90cc, 50cc & 139QMB Scooter Engines

RUTU #ad - We got your back - we stand by the quality of our products. No frills installation - installing and setting up this 49cc bore kit is a breeze. The larger size allows for increased combustion and burning of air and fuel.

The package includes a detailed and easy-to-follow instruction manual to help you through the installation process. Power into overdrive - designed to boost and enhance a scooter's horsepower, as well as torque for better acceleration. If you're not satisfied with the performance of the kit, contact us to avail of our no questions asked 1-year replacement warranty. The cylinder is crafted out of strong steel.

Designed for scooters - this engine kit is made for scooters with 139qmb and 49cc and 50cc GY6 engines. It comes with a 50mm cylinder block with 90cc displacement, a racing AC CDI, and A7TC spark plugs. Built to last - choose mod parts you can trust. This big bore kit for 49cc scooter's piston rings are made from alloy while the piston is made from aluminum.
BrandRUTU #ad
ManufacturerRUTU #ad
Part NumberRUTU69

8. Glixal


Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart

Glixal #ad - High performance upgrade 47mm cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc engine. 4. Include cylinder, piston pin clip, piston pin, piston ring, Tensioner Gasket, Piston, Exhaust Gasket, valve oil seal, gaskets, Intake&Exhaust Studs, Exhaust Nut.3. High quality Durable Piston Rings. 2. Outer diameter of Piston Pin: 13mm. 1. Inner diameter of Cylinder: 47mm. 5.
BrandGlixal #ad
ManufacturerAT MOTOR PARTS #ad
Part NumberATMT1-008

9. AH


CLEO GY6 180cc Cylinder Head Kit Assy 61mm Big Bore with 69mm Valves for 152QMI 157QMJ Scooter Moped ATV Go Kart Quad

AH #ad - Cylinder body:bore 61mm;piston Diameter 61mm; Piston Pin Diameter 15mm ;. Cylinder head:intake valve od 26mm;Exhaust Valve OD 23mm;Combustion Chamber Diameter-61mm. Fit gy6 150cc 180cc 61mm 4 strokes 152qmi 157QMJ Engine Scooter Moped.
BrandAH #ad
ManufacturerAH #ad
Part NumberHDTG



GOOFIT Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart

GOOFIT #ad - One week money back guarantee if not satisfied. Inner diameter of cylinder: 47mm, Outer Diameter of Piston Pin: 13mm. Include cylinder, gaskets, intake&exhaust studs, Piston Ring, valve oil seal, piston, Tensioner Gasket, Piston Pin, Piston Pin Clip, exhaust gasket, Exhaust Nut. Easy installation with video instruction, you can visit the video on our Facebook homepage and Youtube. High performance upgrade 47mm cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc engine.
BrandGOOFIT #ad
ManufacturerGOOFIT #ad
Weight0.11 Pounds
Part NumberGroup-11-B