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Top 8June 2025

Best 49cc Big Bore Kit

We made a list of the top 8 49cc Big Bore Kit based on verified reviews, popularity and other factors which we summarized for you in this list.

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GY6 49cc to 100cc 50mm Big Bore Cylinder Kit with Cylinder Head Assy for 139QMB 139QMA Scooter Moped ATV Engine (69mm Valve Length)

✓Inner Diameter of Cylinder Sleeve: 50mm
✓Outer Diameter of Piston Pin: 13mm
✓This a Non EGR Cylinder Head, Does Not Have the EGR Port
✓Valve Length-64mm, Intake Valve Diameter- 18.5mm, Exhaust Valve Diameter-16mm
✓High Performance Upgrade 50mm Rebuild Kit for 139QMB 139QMA Engine

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44mm Big Bore Cylinder Piston Ring Kit 44-6 for 2 Stroke Engine 43cc 47cc 49cc Pocket Mini Dirt Bike ATV Quad Gas Scooter Coolster Mini Pocket Bike

✓What you get: 1x 44mm Big Bore Cylinder kit (as shown in the first picture). Installation Instruction are NOT Included. NOTE: Please check the model and size carefully before purchase
✓Universal applicability: Cylinder piston kit fits for 2 Stroke 43cc 47cc 49cc Gas Scooter Mini Pocket Bike
✓Size: Cylinder inner diameter: 44mm / 1.7" and other detailed dimensions as shown in the pictures
✓High quality: The materials used to make the cylinders are chosen in strict accordance with industry standards and are rigorously tested for use after production is complete. Piston gasket kits have precise densities to provide a reliable seal

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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

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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

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GOOFIT 44mm Big Bore 53cc 54cc Top End Kit for 2 Stroke 47cc 49cc Engine Mini Quad Pocket Bike

✓Fit for 2 stroke 43cc 47cc 49cc 50cc engine(read description for more fitment infos)
✓Performance upgrade part for Chinese 47/49CC engines (Increase your HP by 2hp - 3hp over your regular engine)
✓Piston diameter :44 mm,piston pin length: 37 mm.please check with the size before your stock one
✓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.

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GOOFIT Modified Blue 6 Teeth Carburetor Air Filter Assembly with 44mm Big Bore Cylinder Ignition Coil Replacement for 2 Stroke 47cc 49cc ATV Quad Dirt Pocket Bike Mini Motorcycle

✓Cylinder Dimensioni:44mm/1.73";Intake carburetor manifold diameter:19mm/0.74";Air Filter Inner Diameter:58mm/2.28";Spark plug:A7TC.
✓Engine Cylinder Carburetor with Air Filter Ignition Coil Set Replacement for 47cc 49cc ATV Quad Dirt Pocket Bike Mini Motorcycle.
✓Improve engine performance,increase horsepower,increase speed.
✓Heavy-duty,durable,fuel efficient,and silent to help keep your bike running at peak performance.
✓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.

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GOOFIT 44mm Big Bore Cylinder Top End Kit for 2 Stroke 47cc 49cc Mini Quad Pocket Bike Chain Saw

✓Cylinder diameter:44mm/1.73",piston pin diameter:12mm/0.47".
✓Replacement for 2 stroke 47cc 49cc mini quad pocket bike chain saw.
✓High-quality materials ensure durability and sealing, and precise fit simplifies the assembly process.
✓Improved airway design enhances fuel efficiency, increasing power while saving energy and reducing emissions.
✓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.

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GOOFIT 44mm Cylinder Carburetor Air Filter Ignition Coil Set Big Bore 53cc 54cc Top Kit of Piston for 47cc 49cc 2-Stroke Engine Pocket Bike Atv Quad Motocyle Red

✓Size:Cylinder Size:44mm;Carb Manifold Intake Diameter:19mm;Air filter:58mm;Piston Pin:12mm;Spark Plug Model:A7TC;Color:Red.
✓44mm Cylinder Carburetor Air Filter Ignition Coil Set Big Bore 53cc 54cc Top Kit of Piston replacement for 47cc 49cc 2-Stroke Engine Pocket Bike Atv Quad Motocyle.
✓Package Included:Big bore 53cc 54cc engine cylinder piston head;3 Big Bore 53cc 54cc update of 2 Strokes 49cc; Mini pit bike ATV Pocket bike Engine cylinder head.
✓Preferred Material,Fine Manufacturing,Corrosion Resistant,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.

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