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The Best Gy6 Big Bore Kit of 2023 – Reviewed and Top Rated

2,585 Reviews Scanned

SaleRank No. #1
Glixal ATMT1-011 139QMB 139QMA Scooter Big Bore Cylinder Kit Rebuild Kit GY6 100cc 50mm Moped ATV Go-Kart
  • 1.Please note this kit is only used for GY6 139QMB 4-Stroke Engine.
  • 2.Inner Diameter of Cylinder: 50mm
  • 3.Outer Diameter of Piston Pin: 13mm
  • 4.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
  • 5. High Performance Upgrade 50mm Cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc 100cc engine
Rank No. #2
GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit for 69mm Valve 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrade Set with 6pin Racing CDI Ignition Coil Performance Spark Plug Clutch Spring
  • This big cylinder kit will upgrade your gy6 50cc 60cc 80cc to 100cc, without EGR, to get more RPM,more power, faster maximum speed.
  • 69mm valve length version
  • Simple Installation
  • With cylinder body kits, cylinder head kits, camshaft, camshaft seat kits, gaskets kits, oil pump and gear, spring sets, copper roller sets, 6pins racing AC CDI, ignition coil and racing 3-electrode spark plug
  • Upgrades parts kits for most of 50cc scooter
Rank No. #3
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
  • This big cylinder kit will upgrade your gy6 50cc 60cc 80cc to 100cc, without EGR, to get more RPM,more power, faster maximum speed.
  • 64mm valve length version
  • Easy Installation
  • Upgrade engine parts included cylinder body kits, cylinder head kits, camshaft, camshaft seat kits, gaskets kits, oil pump and gear, clutch spring sets, copper roller sets, 6pins racing AC CDI, ignition coil and racing 3-electrode spark plug
  • Upgrades parts kits for most of 50cc scooter
Rank No. #4
hongyu 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped
  • Fit GY6 50cc to 100cc 139QA 139QMB Engine
  • Head Valve length 69mm, not 64mm
  • Cylinder Bore Diameter : 50mm
  • Kit includes: Cylinder head, cylinder block assembly, intake pipe screw, exhaust pipe screw, exhaust pipe nut, exhaust pipe gasket four locating pins.
  • For your quick use of new accessories, please consult the picture information and product description before purchasing
SaleRank No. #5
Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart
  • 1.Inner Diameter of Cylinder: 47mm
  • 2.Outer Diameter of Piston Pin: 13mm
  • 3.High Quality Durable Piston Rings
  • 4.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
  • 5. High Performance Upgrade 47mm Cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc engine
Rank No. #6
RUTU 69mm Valve GY6 Big Bore Kit 100cc,with 6pin Racing CDI Ignition Coil,Compatible with Big Bore Kit for 49cc, 50cc & 139QMB Scooter Engines - 50mm Cylinder Block, 90cc, Boosts HP & Speed 5-10mph
  • 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.
  • Power Into Overdrive - Designed to boost and enhance a scooter's horsepower, as well as torque for better acceleration. The larger size allows for increased combustion and burning of air and fuel.
  • 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. The cylinder is crafted out of strong steel.
  • No Frills Installation - Installing and setting up this 49cc bore kit is a breeze. The package includes a detailed and easy-to-follow instruction manual to help you through the installation process.
  • We Got Your Back - We stand by the quality of our products. If you're not satisfied with the performance of the kit, contact us to avail of our no questions asked 1-year replacement warranty.
SaleRank No. #7
GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad
  • 【Noted】It is upgrade cylinder kits, the outer size of the cylinder is 63.8mm, the normal gy6 engine 125/150cc cylinder outer size is 61mm, you have to bore out the crank case for this to fit on most bikes with machine shop work
  • 【Cylinder Bore】:Upgrade from 57.4mm to 61mm, outer size: 63.8mm Cylinder kits with more power,
  • 【Full sets of parts】: Complete parts is suitable for motorcycle maintenance shop, motorcycle parts supermarket and personal use with nice price.
  • 【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, 61mm Bore Cylinder Block, Set of 61mm Piston Assy, Piston, Rings and Wrist Pin, Gaskets.
Rank No. #8
69mm Valve GY6 Cylinder Rebuild Kit 100cc Big Bore Kit With Racing CDI/Ignition Coil/Spark Plug/Clutch Spring / 50mm Bore Upgrade Set Compatible With 49CC 50CC 139QMB Moped Scooter Engine
  • Function: You can get higher RPM, power and speed without EGR. And Upgrade your gy6 50cc 60cc 80cc to 100cc.
  • Compatible With: Zhong Hu 50cc / Zongshen Metro 50cc Agility 50 / People S50 4T / Suer 8 50 4T Pagsta mini 49cc--50cc 4 stroke Sinski XSJ50QT-6 / XSJ50QT-B Bahama / Maui / Sicily / Tank / Baotian 50QT-9--Roketa 49cc 50cc 4 stroke scooter Sunl SL50QT-16 / SL50QT-18 / SL50QT-2 / SL50QT-3
  • Compatible With: Jalon JL50QT-15 / JL50QT-16 / JL50QT-18 / JL50QT-21 / JL50QT-21 Falcon Baotian BT49QT-2 / BT49QT-7 / BT49QT-9 / BT50QT-9 / BT50QT-11 / Dotera 50QT-11 motorsports SC-50 sun city / primo / DR50 / Dirt Runner 49--Baja 49cc 50cc 4 stroke scooters GT5 / Fastwind / AMT50-A1 / CY50-A / CY50-B / CY50-T3 / Funny50 / Roman 50 / Retro 50 / Speedy50 / Venus50--Taotao 49cc 50cc 4 stroke scooter
  • Compatible With: GY6 4-stroke 49cc 50cc 60cc 80cc from china. engine SSR Lazer 5 Moped Verucci VC50TS-3M Zongshen ZS50QT-4 VIP future champion 4 stroke Fly 49cc 50cc 4-stroke scooters Tank 49cc 50cc 4-stroke scooters Jinlun 49cc 50cc 4-stroke scooters Sport 50--Eton 49cc 50cc 4 stroke warrior 50--Jonway 49cc 50cc 4 stroke scooters
  • Content: 1* set of 6 gram racing pure copper roller weights 1* cylinder head with 69mm valve 1* rocker arms assembly 2* valve seals 1* oil pump assy 1* 50mm bore cylinder block 1* set of 50mm piston assy 1* all engine gasket 1* set of intake manifold, muffler bolts, and exhaust locking hat 1* 6pins racing AC CDI 1* racing ignition coil 1* racing 3-electrode A7TC spark plug 1* set of clutch small racing spring 1* racing clutch big spring
Rank No. #9
GY6 180cc Cylinder Head Kit Assy 61mm Big Bore with 69mm Valves for 152QMI 157QMJ Scooter Moped ATV Go Kart Quad
  • Fit GY6 150cc 180cc 61mm 4 Strokes 152QMI 157QMJ Engine Scooter Moped
  • Cylinder Head:Intake Valve OD 26mm;Exhaust Valve OD 23mm;Combustion Chamber Diameter-61mm
  • Cylinder Body:Bore 61mm;Piston Diameter 61mm; Piston Pin Diameter 15mm
Rank No. #10
Glixal ATMT1-020 High Performance GY6 58.5mm 155cc Big Bore Rebuild Kit Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV
  • Easy installation: You can install this kit directly to your GY6 125cc -150cc engine
  • Cylinder Sleeve ID: 58.5mm; Cylinder Sleeve OD: 60.3mm
  • Outer Diameter of Piston Pin: 15mm
  • Only Fit 54mm Stud Spacing GY6 125cc 150cc 157QMJ Engine. (Will Not fit GY6B Engine with 57mm Stud Spacing)0mm Bolt Pattern
  • 5.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
Rank No. #11
GY6 Cylinder Rebuild Kits Trkimal 47mm 80cc Big Bore Upgrade Kits for 49cc 50cc 139QMB Engines 64mm Valve scooter moped parts, GY6 Engine parts for Chinese Scooter(64mm Valve Length)
  • 【Cylinder Bore】: 47mm / Non-EGR Cylinder
  • 【Valve length】: 64mm
  • 【Apply to】: GY6 4 stroke 49cc 50cc 60cc 80cc engine upgrade for most of chinese scooter, atv and go karts
  • 【Parts included】:GY6 80cc Cylinder Head with 64mm valve, 47mm Bore Cylinder Block, Set of 47mm Piston Assy, Piston, Rings and Wrist Pin, Full Set of Engine Gasket, 6pins CDI, Ignition coil, 4pin AC regulator, relay, A7TC Spark Plug, Set of Intake Manifold and Muffler Bolts, and Exhaust locking ha, Set of 8.5 Gram roller , Rocker Arms, Valve Seals, Oil Pump Assy with Driving Gear, Camshaft, Camshaft chain 82, belt 699*18*30, Chain adjuster, Oil screen, spring, cover and oil seal, Starter clutch
  • 【Fit to】Roketa, Sunl, Baja, Taotao, Panterra, Redcat Tank Giovanni Wildfire Xtreme Seaseng Qlink Yiben Jonway Jmstar, Vento
Rank No. #12
Trkimal 50mm Cylinder Kits for GY6 49CC 50CC 139QMB Engine, Upgrade GY6 100cc Big Bore Rebuilt Cylinder Kits 4 Stroke Motor for Moped Scooter ATV Go Kart.
  • 1.Inner Diameter of Cylinder bore: 50mm, Outer Diameter of Piston Pin: 13mm
  • 2.Outer Diameter of Piston: 50mm
  • 3.Easy installation, Upgrade your engine from 50cc to 100cc with more power to climb hill
  • 4.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
Rank No. #13
hongyu 61mm Big Bore Cylinder Head Kit for GY6 125cc to 180cc Engine with 69mm Valves scooter taotao kazuma ATV Moped
  • Fit GY6 150cc to 180cc 152QMI 157QMJ Engine
  • Head Valve length 69mm,Not 64mm
  • Cylinder Bore Diameter : 61mm
  • For your quick use of new accessories, please consult the picture information and product description before purchasing
Rank No. #14
Glixal 52mm Big Bore Cylinder Kit Rebuild Kit GY6 49cc 50cc to 105cc 139QMB 139QMA Scooter Moped ATV Go-Kart
  • 1.Please note this kit is only used for GY6 139QMB 4-Stroke Engine.
  • 2.Inner Diameter of Cylinder: 52mm
  • 3.Outer Diameter of Piston Pin: 13mm
  • 4.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
  • 5. High Performance Upgrade 52mm Cylinder Rebuild Kit for GY6 49cc 50cc 60cc 80cc 100cc engine
Rank No. #15
Trkimal GY6 150cc 57.4mm Bore Cylinder kit with Piston Kit 4 Stroke 152QMI 157QMJ for TAOTAO JONWAY ZNEN Roketa ATV Moped Go-Kart
  • 1.Inner Diameter of Cylinder: 57.4mm
  • 2.Outer Diameter of Piston Pin: 15mm
  • 3.Easy installation, Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut.
  • 4.Complete new products with the famous Chinese brand in the field of cylinder, piston and piston rings.
Rank No. #16
TCMT GY6 50CC To 80CC Big Bore Cylinder Fits For SUNL Roketa Taotao Baja 4 Stroke Scooters
  • Condition: Aftermarket 100% Brand New; Fit for scooters with 139QMB,139QMI or 147QME engines. Cylinder Stroke:41.5mm Cylinder Diameter:47mm
  • Good Working Condition and Easy to Install (No Installation Instruction).
  • Material: Aluminum; Cylinder Stroke:41.5mm; Cylinder Diameter:47mm
  • High class quality and very durable.
  • Package included:As Picture Shown
Rank No. #17
Glixal ATMT1-023 High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit For 152QMI 157QMJ Engine Chinese Scooter Moped ATV
  • 1.Please Note: 61mm Bore Cylinder May Require to Machine the Crankcase on Some Engine Models
  • 2.This Cylinder fits the 76mm Bolt Pattern Engine, It will not work on the 80mm Bolt Pattern
  • 3.Outer Diameter of Piston Pin: 15mm
  • 4.Inner Diameter: 61mm and Outer Diameter: 65mm
  • 5.Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
Rank No. #18
New 61mm Cylinder Kit fit for 4 Strokes GY6 125cc 150cc 152QMI 157QMJ Engine Scooter ATV & Quad Moped Rebuild Kit Cylinder Head
  • Cylinder Kit fit for:4 Strokes GY6 125cc 150cc 152QMI 157QMJ Engine Scooter ATV & Quad Moped Rebuild Kit Cylinder Head
  • Package Included:1*61mm Cylinder Kit(as shown in the figure)
  • Diameter of the Cylinder Kit:61mm;Diameter of Piston Pin:15mm
  • Characteristic:The reticulated process has good sealing performance,increases the contact surface,increases the oil storage and lubrication function,reduces wear and reduces fuel consumption.Efficient heat dissipation,strong power,durable and wear-resistant.
  • Note: Please check the number and size of the product carefully before placing the order. Make sure it fits your machine,Thank you!
Rank No. #19
GOOFIT 57.4mm Big Bore Cylinder Kit Replacement for 150cc 4stroke GY6 157QMJ Engine Rebuild Kit Cylinder Head Chinese Scooter
  • Cylinder diameter:57.4 mm/2.25";Piston diameter:57.4mm/2.25";Piston pin diameter:15mm/0.59";Piston pin length:42mm/1.65"(Please check the size carefully before you place the order).
  • Big Bore Cylinder Kit Replacement for TaoTao SUNL Buyang JCL Baja 150cc 4stroke GY6 157QMJ Engine Rebuild Kit Chinese Scooter.
  • The cylinder is the core of the engine.It burns the mist-like oil and air in it,pushes the piston inside to move up and down,converts chemical energy into mechanical energy,and generates power.
  • The reticulated process has good sealing performance,increases the contact surface,increases the oil storage and lubrication function,reduces wear and reduces fuel consumption.Efficient heat dissipation,strong power,durable and wear-resistant.
  • Warranty:We are always available to help our customers.If you are not satisfied with the order,please leave us a message.Wish you have a happy shopping experience,we are committed to providing the best service.
Rank No. #20
GOOFIT Big Bore Cylinder Rebuild Kit for GY6 50cc 139QMB Racing Scooter Parts 64mm Valve
  • It can be Only Used for GY6 4stroke 49cc 50cc engine upgrade
  • Easy installation with video instruction,you can visit the video on our facebook homepage and Youtube.
  • Best way to get more RPM,maximum upgrade kit for GY6 50cc 139QMB engine and 1P39QMB Engine.
  • Valve Length 64mm ,does not for 69mm one
  • The Belt Cover/CVT Cover Gasket is for a Short Case Version

Last update on 2023-08-10 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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If you think that anything we present here regarding Gy6 Big Bore Kit is irrelevant, incorrect, misleading, or erroneous, then please let us know promptly! We’re here for you all the time. Contact us here. Or You can read more about us to see our vision.

FAQ:

Q: Is the GY6 171cc big bore kit boring?

A: We have spent years testing and selling other kits. Some things we liked and others we didn’t. We pieced this kit together with the best of the best materials (rings, gaskets, springs, and metals) This 171cc kit is a no case boring big bore kit unlike some others on the market.

Q: Which is the big bore engine for a GY6 buggy?

A: (High Torque) Hoca High Angle A13 Performance Camshaft for 150cc and 125cc GY6 4-stroke engines. (Highest Torque) Hoca High Angle A14 Performance Camshaft for 150cc and 125cc GY6 4-stroke engines. Naraku 58.5mm Big Bore Cylinder Kit bumps GY6 150 to 170cc. The stock 150cc cylinder is 57.4mm.

Q: Which is the largest big bore motor kit?

A: Its the largest big bore kit you can go on the GY6 A motor (Chinese GY6 qmj157). Like they say “There is no replacement for displacement “. For the money this kit flat out rocks!

Q: Which is the biggest big bore wrench kit?

A: We pieced this kit together with the best of the best materials (rings, gaskets, springs, and metals) This 171cc kit is a no case boring big bore kit unlike some others on the market. Its the largest big bore kit you can go on the GY6 A motor (Chinese GY6 qmj157).

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