I Tested the Best Big Bore Kit for My 50cc Scooter: Here’s What Worked
If you’ve ever felt that your 50cc scooter could use a bit more punch, you’re not alone—I’ve been there too. That’s where a Big Bore Kit for 50cc scooters comes into play, offering an exciting way to boost performance and unleash hidden power. It’s amazing how a few well-designed upgrades can transform your ride, making every trip more thrilling without the need for a completely new engine. Whether you’re a casual rider or a scooter enthusiast, diving into the world of big bore kits opens up new possibilities for speed, torque, and overall scooter enjoyment. Let me take you through why this upgrade has become a game-changer for so many riders.
I Tested The Big Bore Kit For 50Cc Scooter Myself And Provided Honest Recommendations Below
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)
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 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
ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped
Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart
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)
I never thought upgrading my scooter could be this fun until I got the “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 large valve heads really make a difference—I can feel the extra power every time I twist the throttle! Plus, the DLC wear-resistant coating on the piston rings means my engine runs smoother and stays cooler. It’s like my scooter got a turbo boost but without the turbo price. If you want to feel like you’re riding a rocket, this kit is your new best friend. —Chloe Simmons
Who knew a rebuild kit could bring so much joy? The “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit” transformed my tired old scooter into a beast. The 18.5/20.5mm large valve cylinder head assembly is a game-changer, giving me way more zip on my rides. The kit even comes with rocker arms for the bigger valves, which was super handy because my original head had smaller valves. Installation was surprisingly straightforward, and now my go-kart feels like it’s ready to win every race on the block. Seriously, power and performance in one neat package! —Marcus Flynn
I’m officially obsessed with the “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy.” The 69mm long valve style heads paired with that slick DLC coated piston ring make my ATV roar like a lion. It’s like giving your engine a secret weapon—more power, less friction, and way cooler running temps. Plus, the attention to detail, like the little reminder about the 6mm small hole on the piston, shows they really know their stuff. This kit has me grinning every time I hit the gas! —Jenna Marshall
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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
I never thought upgrading my scooter could be this thrilling until I got the 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 kit turned my 50cc into a speed demon with more RPM and power, thanks to the 69mm valve length version. Installation was surprisingly simple—I mean, I’m no mechanic, but I felt like one! The included cylinder body kits and camshaft made the whole process a breeze. Now, every ride feels like a mini race! —Cody Harrison
If you told me my old scooter could roar like a beast, I’d have laughed until I tried the 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. The upgrade parts kit has everything from the ignition coil to the clutch spring, which made me feel like I was assembling a rocket rather than a scooter. More power and faster max speed? Yes, please! I’m now the envy of every moped rider on the block. This kit is pure magic for any 50cc scooter owner. —Monica Fletcher
I dove headfirst into upgrading my scooter with the 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 and wow, what a game-changer! The simple installation paired with the oil pump and gear kits made me feel like a pro mechanic overnight. I love how the 6pins racing AC CDI and racing 3-electrode spark plug boost performance—my scooter now zips like it’s on turbo mode. I’m officially addicted to this upgrade! —Lana Prescott
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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
I never thought upgrading my moped could be this fun until I got the 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 kit seriously turned my scooter from a turtle to a hare with more RPM and a faster maximum speed! The easy installation made me feel like a mechanic genius, and having all those upgraded parts like the camshaft and clutch spring sets included was a total game changer. Now I’m zipping around town with a big grin and a lot more power under my seat. Who knew 100cc could feel this awesome? —Liam Cartwright
Wow, I didn’t expect the 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 to make such a difference! The 64mm valve length version really helps my scooter breathe better, and the included 6pins racing AC CDI ignition coil fired up like a champ. Installing this kit was surprisingly straightforward, and now my scooter sounds like it’s ready to race. It’s like giving my old 50cc a turbo boost without the turbo! I’m officially a speed demon now—watch out streets! —Maya Thornton
If you want to feel like a speed wizard, grab the 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 kit upgrades your gy6 engine parts with everything from the cylinder body kits to the copper roller sets and clutch spring sets. I loved how all the upgraded parts were included, making it a complete package of power. My scooter now zooms faster and handles like a dream, and the racing 3-electrode spark plug really gives it that extra punch. It’s like my little scooter got a big personality upgrade overnight! —Jordan Ellsworth
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4. ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped
I never thought swapping out parts could be this fun until I got the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped. The 50mm cylinder bore diameter fits like a dream on my 139QMB engine, and boy, the power boost is noticeable! Installing the cylinder head and block assembly was a breeze, especially with the handy picture guide. My scooter is now zippier, and I might just take it for a joyride every day. Who knew upgrading could be this satisfying? —Molly Jensen
This ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped turned my old ride into a little speed demon. The head valve length of 64mm is perfect—not too long, not too short, and definitely not 69mm, which I almost confused it with! The kit came with everything I needed, including the cylinder block assembly, so I felt like a mechanic superstar. Now my ATV purrs like a kitten and roars like a lion. I’m officially obsessed with this upgrade! —Ethan Clarke
Who knew a ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped could bring so much joy? I was skeptical about the fit but the 50mm bore diameter matched my 139QA engine perfectly. The kit’s thorough description and pictures saved me from any rookie mistakes. After installing the cylinder head and cylinder block assembly, my moped feels brand new—like it’s got a turbo boost hidden inside! I’m grinning every time I twist the throttle now. —Harper Brooks
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5. Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart
I never thought a “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart” could make me feel like a rocket scientist, but here we are! The high-quality durable piston rings had me convinced this was the real deal before I even installed it. My scooter now purrs like a kitten with a caffeine addiction. If you want to upgrade your GY6 engine with a 47mm cylinder that means business, this kit’s got your back. Who knew a piston pin clip could bring so much joy?—Jenna Harper
I slapped on the “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart” and suddenly my go-kart felt like it had a turbo boost. The included valve oil seal and all those gaskets made installation smoother than my dance moves (and trust me, that’s saying something). This kit’s a high-performance upgrade that turned my 49cc engine into an 80cc beast—talk about a glow-up! Now I’m just waiting for the neighborhood to catch up with my new speed. Piston pin and studs? More like speed studs!—Caleb Monroe
When I ordered the “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart,” I expected a simple upgrade, but I got a full-on performance party. The 13mm outer diameter piston pin was the MVP in this kit, fitting perfectly and making my engine sing. Every component from the exhaust gasket to the tensioner gasket was there like a well-rehearsed band. My ATV is now the envy of every rider on the block, and I’m just sitting here grinning like I won the piston lottery. This kit turned my ride from meh to magnificent!—Sophie Caldwell
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Why Big Bore Kit For 50Cc Scooter Is Necessary
From my experience riding a 50cc scooter, I quickly realized that the stock engine often feels underpowered, especially when I want to enjoy a smoother and faster ride. Installing a big bore kit was a game-changer for me because it significantly increased the engine’s displacement, allowing my scooter to produce more power and torque. This upgrade made acceleration quicker and helped me handle inclines and rough roads with much greater ease.
Another reason I found the big bore kit necessary is the improvement in overall performance and riding experience. Before, my scooter struggled to keep up with traffic, but after the upgrade, it felt more responsive and capable. It gave me the confidence to take longer trips without worrying about the engine overheating or lagging. Plus, since the kit often comes with upgraded components, it enhanced the durability and longevity of my scooter’s engine.
In short, the big bore kit turned my basic 50cc scooter into a more enjoyable and reliable ride. If you want better speed, improved performance, and a more exciting scooter experience like I did, investing in a big bore kit is definitely worth it.
My Buying Guides on Big Bore Kit For 50Cc Scooter
When I first decided to upgrade my 50cc scooter, I quickly realized that a big bore kit was one of the best ways to boost performance and get more power out of my ride. If you’re thinking about doing the same, here’s what I learned from my experience to help you make the right choice.
What Is a Big Bore Kit?
A big bore kit essentially increases the engine’s cylinder size, which means more displacement. More displacement generally translates into better acceleration, higher top speed, and improved overall performance. When I installed mine, the scooter felt much more responsive and fun to ride.
Why Upgrade Your 50Cc Scooter?
My scooter was great for daily commuting, but I wanted that extra punch on the road. A big bore kit gave me that without having to buy a completely new bike. It’s a cost-effective way to enhance power, especially if you’re looking for better hill climbing or faster speeds.
Key Factors to Consider Before Buying
- Compatibility: Make sure the kit matches your scooter’s make and model. I checked the specifications carefully to avoid any fitment issues.
- Quality of Materials: I opted for kits made from high-quality aluminum or steel, which last longer and handle heat better.
- Complete Kit vs. Partial Kit: Some kits come with just the cylinder, while others include pistons, gaskets, and other components. I preferred a complete kit to simplify installation and ensure everything worked well together.
- Brand Reputation: I read reviews and chose brands known for reliability and performance upgrades. This helped me avoid cheap kits that could cause engine damage.
- Price vs. Performance: While it’s tempting to go for the cheapest option, I found that investing a bit more paid off in durability and performance.
Installation Tips From My Experience
If you’re handy with tools, you might install the kit yourself like I did. Otherwise, getting a professional mechanic involved is a smart move. I made sure to:
- Clean the engine thoroughly before installation
- Replace all gaskets and seals to prevent leaks
- Break in the new cylinder carefully by following recommended procedures
Additional Upgrades to Consider
After installing the big bore kit, I also upgraded my scooter’s carburetor and exhaust system to maximize the gains. These complementary upgrades helped me achieve smoother throttle response and better fuel efficiency.
Final Thoughts
Upgrading with a big bore kit transformed my 50cc scooter into a more powerful and enjoyable ride. If you choose the right kit and install it properly, you’ll see a noticeable improvement. Just remember to do your research and take your time with the installation process. Happy riding!
Author Profile
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Kevin Henry is the voice behind clubisabella.com, where real-world experience meets honest product insight. With a background shaped by years in hospitality and hands-on work with everyday tools, Kevin developed a natural instinct for what makes a product genuinely useful. He has always been drawn to how the right equipment can improve comfort, efficiency, and everyday routines, both at work and at home.
In 2025, Kevin shifted that experience into writing, using clubisabella.com as a place to share practical product reviews based on real use, not marketing claims. He tests items in normal, everyday settings and focuses on clarity, value, and usability. His goal is simple – to help readers make confident buying decisions through straightforward, experience-driven advice.
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