Best Big Bore Cylinder Kits

What are the best Big Bore Cylinder Kits to upgrade your scooter’s performance? Let us guide you to a perfect choice and an exciting ride.

Big bore kits make your scooter go faster. Riders love the thrill of pure power and speed. Your engine becomes stronger and runs better.

We pick the top kits that fit your vehicle perfectly. Trust us to find the right upgrade for your ride today.

See how simple upgrades change your driving experience. Read on to find the best kit for your scooter.

List of Top 10 Big Bore Cylinder Kits

Title	Best For	Price
Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy for 139QMB 139QMA 147QMD Engine Scooter Moped ATV Go-Kart (69mm-18.5/20.5mm Larger Valves)	This kit is for scooter and ATV owners. You need more power today.	View on Amazon (paid link)
Glixal GY6 100cc 50mm Big Bore Cylinder Kit for 139QMB 139QMA Engine	This Glixal GY6 100cc 50mm Big Bore Cylinder Kit is perfect for anyone with a GY6 139QMB 4-Stroke Engine looking to upgrade their scooter or ATV. It’s easy to install and boosts performance for a smoother ride.	View on Amazon (paid link)
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 GY6 Cylinder Rebuild Kit is perfect for moped and scooter owners who want more power and speed. It’s ideal for upgrading 50cc to 80cc engines to 100cc easily.	View on Amazon (paid link)
Glixal ATMT1-008 GY6 80cc 47mm High Performance Big Bore Cylinder Kit	This kit is the perfect choice for scooter riders who want a faster ride. It fits anyone who needs a reliable and strong engine.	View on Amazon (paid link)
58.5mm Cylinder Head Assy Big Bore Cylinder Kit for GY6 155cc Engine	This 58.5mm Cylinder Head Assy Big Bore Cylinder Kit is perfect for GY6 155cc engine owners who want strong power and better performance. It’s ideal for those with 54mm stud spacing engines, not GY6B models.	View on Amazon (paid link)
Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit, Cylinder with Piston Ring Kit for Most Chinese 90cc 110cc 125cc Engines, Replacement for Taotao, Replacement for SSR	This Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit is perfect for anyone with a Chinese 90cc, 110cc, or 125cc engine in their ATV, dirt bike, go kart, or pocket bike. It’s easy to install and improves engine cooling, making it ideal for riders who want reliable performance and longer engine life.	View on Amazon (paid link)
NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha BP4-HS000-00	Young riders needing more speed will love this big 60cc upgrade for their Yamaha PW50. It is perfect for racing and growth.	View on Amazon (paid link)
ABCERRSI 52.4mm Big Bore Cylinder and Head with Piston Ring Rebuild Kit and Gaskets Compatible with 4 Stroke Horizontal 110cc Chinese Taotao Coolster Engine ATV Go Kart Dirt Bike	This kit fits 110cc ATVs and go karts. It fixes Taotao engines.	View on Amazon (paid link)
Glixal High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit	This Glixal High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit is perfect for DIY enthusiasts and mechanics who want to upgrade their 76mm bolt pattern engines. It’s ideal for those seeking better performance with a complete kit that includes all essential parts.	View on Amazon (paid link)
Trkimal Performance Upgrade Big Bore Cylinder Kit GY6 80cc 47mm for GY6 49cc 50cc 139QMB ATV Scooter Moped Go Kart	This Trkimal Performance Upgrade Big Bore Cylinder Kit is perfect for anyone who wants to boost their GY6 49cc or 50cc engine to 80cc. It’s great for ATV, scooter, moped, or go-kart owners looking for more power and easy installation.	View on Amazon (paid link)

Detailed Reviews

Discover the top 10 Big Bore Cylinder Kits handpicked for performance and value. Each kit is expert-reviewed and customer-approved, ensuring you get the best upgrade for your ride. Whether you seek speed, power, or reliability, this guide has you covered—find your perfect match today!

1. Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy for 139QMB 139QMA 147QMD Engine Scooter Moped ATV Go-Kart (69mm-18.5/20.5mm Larger Valves)

Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy for 139QMB 139QMA 147QMD Engine Scooter Moped ATV Go-Kart (69mm-18.5/20.5mm Larger Valves)

The Glixal GY6 100cc Big Bore Kit boosts your scooter, ATV, or go-kart engine. It includes a large valve head for more power. Perfect for 139QMB, 139QMA, and 147QMD engines.

This kit has 18.5/20.5mm valves, bigger than stock. Works with 69mm valve heads. If your head has 64mm valves, swap the rocker arms with ours.

The DLC-coated piston rings reduce wear and friction. Includes a short case gasket for 8-bolt engines. Always check the AT marking on the piston for proper setup.

Pros	Cons
Boosts power with larger valves for your scooter or ATV. DLC coating protects and reduces friction for longer life. Easy upgrade for GY6 engines with included parts. Compatible with 69mm valve heads for seamless fit.	Rocker arm swap needed for 64mm valves—extra work required. Short case gasket only—won’t fit all engine types. Piston alignment is critical—mistakes can cause damage.

Perfect For:

This kit is for scooter and ATV owners. You need more power today.

Ready to Purchase?

View Price on Amazon (paid link)

2. Glixal GY6 100cc 50mm Big Bore Cylinder Kit for 139QMB 139QMA Engine

The Glixal GY6 100cc 50mm Big Bore Cylinder Kit is a high-performance upgrade for your engine. It’s designed for GY6 139QMB 4-stroke engines, ensuring a perfect fit. This kit boosts your engine’s power and efficiency.

It includes all essential parts like the cylinder, piston, and gaskets. The 50mm inner diameter and 13mm piston pin deliver top performance. Installation is straightforward with everything you need included.

This kit is ideal for 49cc to 100cc engines, offering a reliable rebuild solution. Upgrade your engine with Glixal’s quality parts for better performance and durability.

Pros	Cons
Boosts engine power with a 50mm big bore upgrade. Complete kit includes cylinder, piston, and gaskets. Fits GY6 139QMB engines perfectly for easy installation. High performance for 49cc to 100cc engines. Durable parts ensure long-lasting reliability.	Limited to GY6 139QMB engines only, not universal. No installation tools or instructions included, extra work needed. Professional help may be required for proper fitting.

Perfect For:

This Glixal GY6 100cc 50mm Big Bore Cylinder Kit is perfect for anyone with a GY6 139QMB 4-Stroke Engine looking to upgrade their scooter or ATV. It’s easy to install and boosts performance for a smoother ride.

Ready to Purchase?

View Price on Amazon (paid link)

3. 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

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

Upgrade your ride with the GY6 Cylinder Rebuild Kit. This big bore kit boosts your engine from 50cc to 100cc, giving you more power and speed. It’s perfect for mopeds and scooters.

The kit includes everything you need for a simple installation. From the cylinder body to the racing spark plug, it’s all here. Plus, it works with most 50cc scooters.

Get higher RPM and a faster top speed with this easy upgrade. It’s a great way to improve your ride’s performance.

Pros	Cons
Upgrade to 100cc for more power and speed. Easy install with all parts included. Fits most 50cc scooters, perfect for upgrades. Racing CDI and spark plug boost engine performance.	Not for all engines, check fit before buying. No EGR included, less eco-friendly choice. Install may be tricky, pro help might be needed.

Perfect For:

This GY6 Cylinder Rebuild Kit is perfect for moped and scooter owners who want more power and speed. It’s ideal for upgrading 50cc to 80cc engines to 100cc easily.

Ready to Purchase?

View Price on Amazon (paid link)

4. Glixal ATMT1-008 GY6 80cc 47mm High Performance Big Bore Cylinder Kit

Unlock pure speed with this upgrade. Give your scooter engine a massive boost.

Feel the extra power on every ride. Leave slow traffic far behind you. Enjoy a smooth trip every single day.

Get this complete kit right now. Fix your ride with zero stress. Build a fast machine today.

Pros	Cons
Boosts engine power with a 47mm big bore upgrade. Durable piston rings ensure long-lasting performance. Complete kit includes all essential parts for easy installation. Fits GY6 engines from 49cc to 80cc seamlessly.	Not for beginners: Requires expert installation and tuning. Limited compatibility: Only fits specific GY6 engines. Higher fuel consumption: Performance upgrade may use more fuel.

Perfect For:

This kit is the perfect choice for scooter riders who want a faster ride. It fits anyone who needs a reliable and strong engine.

Ready to Purchase?

View Price on Amazon (paid link)

5. 58.5mm Cylinder Head Assy Big Bore Cylinder Kit for GY6 155cc Engine

This 58.5mm Cylinder Head Assy Big Bore Cylinder Kit is specially designed for GY6 155cc engines. It fits perfectly with 54mm stud spacing on GY6 125cc, 150cc, and 157QMJ engines.

The kit includes a non-EGR head without an EGR port. It features precise dimensions for optimal performance, ensuring strong power and efficient heat dissipation.

High-quality materials make it durable and corrosion-resistant. Enjoy stable operation and longevity. Professional after-sales support ensures a satisfying shopping experience.

Pros	Cons
Unleash massive power with this big bore kit. Stay cool with super heat dissipation design. Save gas while enjoying stable performance. Built to last with high grade materials.	Will not fit some GY6 engines Has no EGR port for older setups Needs exact stud spacing to work

Perfect For:

This 58.5mm Cylinder Head Assy Big Bore Cylinder Kit is perfect for GY6 155cc engine owners who want strong power and better performance. It’s ideal for those with 54mm stud spacing engines, not GY6B models.

Ready to Purchase?

View Price on Amazon (paid link)

6. Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit, Cylinder with Piston Ring Kit for Most Chinese 90cc 110cc 125cc Engines, Replacement for Taotao, Replacement for SSR

Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit, Cylinder with Piston Ring Kit for Most Chinese 90cc 110cc 125cc Engines, Replacement for Taotao, Replacement for SSR

The Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit is a perfect fit for most Chinese 90cc, 110cc, and 125cc engines. It works great for ATVs, dirt bikes, go-karts, and more.

This kit improves cooling, prevents overheating, and is easy to install. It includes everything you need: piston, cylinder block, gaskets, and piston rings.

Pros	Cons
Keeps engine cool and running long Easy install saves you time Fits most Chinese 110cc models Includes all parts for rebuild Big bore upgrade boosts performance	Not universal, may not fit all engine models. No tools included, requires separate purchase for installation. Limited warranty, potential risk if parts fail early.

Perfect For:

This Anxingo 52.4mm Engine Cylinder Big Bore Rebuild Kit is perfect for anyone with a Chinese 90cc, 110cc, or 125cc engine in their ATV, dirt bike, go kart, or pocket bike. It’s easy to install and improves engine cooling, making it ideal for riders who want reliable performance and longer engine life.

Ready to Purchase?

View Price on Amazon (paid link)

7. NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha BP4-HS000-00

This kit fits your Yamaha PW50 from 1981 to 2023. It gives your bike a 60cc big bore boost. Upgrade your gear today.
Get a full set of parts to rebuild your motor. It contains the spark plug, gaskets, and piston. Ride harder now.
The bore size goes up to 44mm. It is made from sturdy steel for lasting power. Check the list to be sure it fits.

Pros	Cons
Fits Yamaha PW50 (1981-2023) perfectly, no hassle. All-in-one kit with cylinder, piston, gaskets, and spark plug. Durable steel cylinder ensures long-lasting performance. Easy installation with all essential parts included.	No coating on cylinder sleeve may wear faster. Doesn’t include tools for installation. Steel cylinder might be heavier than aluminum options.

Perfect For:

Young riders needing more speed will love this big 60cc upgrade for their Yamaha PW50. It is perfect for racing and growth.

Ready to Purchase?

View Price on Amazon (paid link)

8. ABCERRSI 52.4mm Big Bore Cylinder and Head with Piston Ring Rebuild Kit and Gaskets Compatible with 4 Stroke Horizontal 110cc Chinese Taotao Coolster Engine ATV Go Kart Dirt Bike

ABCERRSI 52.4mm Big Bore Cylinder and Head with Piston Ring Rebuild Kit and Gaskets Compatible with 4 Stroke Horizontal 110cc Chinese Taotao Coolster Engine ATV Go Kart Dirt Bike

The ABCERRSI 52.4mm Big Bore Cylinder and Head is a complete rebuild kit for your 110cc Chinese engine. It includes everything you need to refresh your ATV, Go Kart, or Dirt Bike. This kit is easy to install and compatible with many popular models.

It fits Coolster, Sunl, BMS, and more. The cylinder measurement is 52.4mm bore, with a piston diameter to match. The kit includes a cylinder head, big bore cylinder, piston ring kit, gaskets, and spark plug.

This rebuild kit is a great choice for engine repairs. It’s simple to use and works with many 110cc engines. Get your vehicle running smoothly with this complete solution.

Pros	Cons
Big bore boost – Adds power to your ride Perfect match – Works on all major brands Complete kit – Everything you need comes together Easy fit – Simple installation for quick results	Must check size before you buy Does not fit all engines You must match specs yourself

Perfect For:

This kit fits 110cc ATVs and go karts. It fixes Taotao engines.

Ready to Purchase?

View Price on Amazon (paid link)

9. Glixal High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit

The Glixal High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit is a powerful upgrade for your engine. It boosts performance and power with its 61mm bore cylinder. This kit is designed for durability and efficiency.

It fits 76mm bolt pattern engines but not 80mm patterns. Some models may need crankcase machining for proper fit. The kit includes all essential parts for a complete rebuild.

This kit comes with a cylinder, piston, rings, and gaskets. It also includes studs, nuts, and seals. Everything you need for a smooth rebuild is included.

Pros	Cons
Boosts engine power with a 170cc big bore upgrade. Fits 76mm bolt pattern engines for easy installation. Complete kit includes all essential parts for rebuild. Precision-engineered with 61mm bore for optimal performance.	Crankcase machining may be needed for some engines. Doesn’t fit 80mm bolt pattern engines. Professional installation is highly recommended.

Perfect For:

This Glixal High Performance GY6 61mm 170cc Big Bore Rebuild Cylinder Kit is perfect for DIY enthusiasts and mechanics who want to upgrade their 76mm bolt pattern engines. It’s ideal for those seeking better performance with a complete kit that includes all essential parts.

Ready to Purchase?

View Price on Amazon (paid link)

10. Trkimal Performance Upgrade Big Bore Cylinder Kit GY6 80cc 47mm for GY6 49cc 50cc 139QMB ATV Scooter Moped Go Kart

Unlock pure speed. Transform your slow ride. Feel the raw power.

Boost your engine now. Ride with total joy.

Pros	Cons
Boosts power from 50cc to 80cc for faster rides. Easy installation with all parts included. Complete kit with cylinder, piston, and gaskets. Reliable support for any product issues.	Needs tools for install Might not fit all bikes Can be loud

Perfect For:

This Trkimal Performance Upgrade Big Bore Cylinder Kit is perfect for anyone who wants to boost their GY6 49cc or 50cc engine to 80cc. It’s great for ATV, scooter, moped, or go-kart owners looking for more power and easy installation.

Ready to Purchase?

View Price on Amazon (paid link)

Buying Guide

Big bore kits make your ride faster and more powerful. Choose the right one to transform your engine.

Factors to Consider When Buying:
– Engine Compatibility: Check if the kit fits your engine model. Wrong parts won’t work.
– Bore Size: Bigger bores mean more power. Pick the size that matches your needs.
– Valve Size: Larger valves improve airflow. Ensure they fit your cylinder head.
– Material Quality: Durable materials last longer. Look for corrosion-resistant parts.
– Included Parts: Kits with all parts save time. Make sure it has everything you need.
– Installation Ease: Simple upgrades are better. Avoid kits that require complex tools.
– Performance Boost: Choose kits that increase speed and power. Read reviews for real results.
– Price: Compare prices for the best value. Don’t sacrifice quality for cost.
– Brand Reputation: Trusted brands offer reliable parts. Check customer feedback.
– After-Sales Support: Good support helps with issues. Look for warranties or assistance.

Engaging Experience:
Feel the thrill of pure power with every ride. A big bore kit turns your vehicle into a high-performance machine. Enjoy faster speeds and smoother trips. Upgrade today and leave slow rides behind.