The Best Gy6 Big Bore Kit of 2020 – Reviewed and Top Rated

2,950 Reviews Scanned

SaleRank No. #1
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
SaleRank No. #2
GOOFIT Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart
  • Inner Diameter of Cylinder: 47mm,Outer Diameter of Piston Pin: 13mm
  • Include Cylinder,Piston,Piston Ring,Piston Pin,Piston Pin Clip,Valve Oil Seal,Gaskets,Tensioner Gasket,Exhaust Gasket,Intake&Exhaust Studs,Exhaust Nut
  • One week money back guarantee if not satisfied
  • 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
Rank No. #3
AH GY6 180cc Cylinder Head Kit Assy 61mm Big Bore with 69mm Valves for 152QMI 157QMJ Scooter Moped ATV Go Kart Quad
  • Fit GY6 180cc 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. #4
69mm Valve Big Bore Kit 100cc for GY6 49CC 50CC 139QMB Moped Scooter Engine 50mm Bore Upgrade Set with Racing CDI Ignition Coil Performance Spark Plug
  • This big bore kit will upgrade your gy6 50cc 60cc 80cc to 100cc, without EGR, to get more RPM,more power, faster maximum speed.
  • We have 2 versions, 64mm and 69mm valve length version. Please confirm before ordering.
  • Easy installation With racing AC CDI, ignition coil and racing 3-electrode spark plug included
  • This is one of the best upgrades you can do to your 50cc Scooter
Rank No. #5
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
SaleRank No. #6
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
Rank No. #7
SMM 12-100-50- Black Chinese Scooter Big Bore Kit 100cc 50mm Bore QMB139/1PQMB139 Engines Scooter Performance Parts Kit
  • 50mm Bore Kit ,Performance Exhaust,20MM Carb,Hp Coil,Hp Cdi,Performance Varaitor
Rank No. #8
AH 61mm Big Bore Cylinder Kit With Piston Ring Pin For 4 Strokes GY6 180cc 152QMI 157QMJ Engine Scooter ATV Go Kart Taotao Baja Roketa
  • Fits: GY6 180cc 61mm Big Bore 4 Strokes Scooter Moped ATV Engine
  • Includes cylinder body ,Bore 61mm
  • Includes Piston kit and Top end gasket set
  • Piston Diameter:61mm Piston Pin Diameter:15mm
  • Bottom hole distance: 63mm Center hole distance: 55mm
Rank No. #9
AH GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad
  • Fit GY6 50-100cc 4 Strokes 139QMA 139QMB Engine Scooter Moped
  • Cylinder Head:Intake Valve OD 18.6mm;Exhaust Valve OD 18mm;Combustion Chamber Diameter-50mm
  • Cylinder Body:Bore 50mm;Piston Diameter 50mm; Piston Pin Diameter 13mm ;
  • Check Pictures and Measurements To Be Sure ,This is the Correct Parts for your Application.
Rank No. #10
MYK 125cc/150cc to 155cc Big Bore Cylinder Kit 58.5mm, Compatible with Scooters GY6 157QMJ
  • Great upgrade for a 150cc Scooter.
  • Direct bolt-on replacement for your current GY6 cylinder body, and no alterations to the engine or crankcase are necessary.
  • This 155cc kit is the largest that can be used in the GY6 without machining of the cases.
  • All New high quality parts
  • Full List of Contents below

Last update on 2020-05-11 / Affiliate links / Product Titles, Images, Descriptions from Amazon Product Advertising API

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