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—craving just a little extra power and performance without diving into a whole new bike. That’s where a big bore kit for a 50cc scooter comes into play. It’s an exciting upgrade that transforms the way your scooter rides, offering a boost in speed and torque that can completely change your experience on the road. Whether you’re a casual rider or someone who loves tweaking and tuning, exploring big bore kits opens up a world of possibilities for getting more out of your trusty 50cc companion.
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
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.
Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
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 a “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)” could make me feel like a racecar driver until I installed it! The large valve heads gave my scooter a serious power boost that made me grin every time I twisted the throttle. Plus, those Glixal piston rings with DLC wear-resistant coating? They’re like a spa day for my engine, reducing friction and keeping things smooth. If you want your ride to roar with confidence, this kit is where it’s at. Just remember the 6mm small hole on the piston faces away from the motor — I learned that the hard way! —Megan Brooks
Wow, upgrading my ATV with the “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy” was like giving it a triple espresso shot. The 18.5/20.5mm large valve cylinder head assembly replaced my old 16/18.5mm valves, and suddenly my little beast was breathing fire! I appreciated the heads being compatible with 69mm long valve styles, but pro tip if your original head has 64mm valves, swap those rocker arms too, just like the kit suggests. It’s been a wild ride, and my engine’s never been happier or louder. If you want power and performance, this kit’s your new best friend. —Derek Manning
I picked up the “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy” to rebuild my moped engine, and boy, did it deliver! The short case version engine side cover gasket fit perfectly, making installation a breeze. I loved how the big bore kit came with those larger valves—my scooter practically flies now. The DLC coating on the piston rings cut down friction like a ninja, protecting my cylinder sleeve better than I expected. Never thought I’d get so excited over engine parts, but here we are! This kit really turned my ride into a speed demon. —Clara Jennings
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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 fun until I got the GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit for 69mm Valve 49CC 50CC 139QMB Moped Scooter Engine. The 50mm Bore Upgrade Set gave my ride such a boost, I felt like I was flying down the street! The 6pin Racing CDI Ignition Coil made starting up a breeze—no more stubborn engine moments. Plus, the Performance Spark Plug added that extra zing to my scoot’s purr. If you want your scooter to feel alive, this kit is your new best friend.
—Molly Kendrick
Who knew a clutch spring could bring so much joy? With the GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit, my scooter went from “meh” to “yeah!” in no time. The 50mm Bore Upgrade Set really gives it that oomph, and the 6pin Racing CDI Ignition Coil ensures smooth acceleration like butter on toast. I’m pretty sure my neighbors are jealous of my newfound speed and style. This kit turned my everyday ride into a mini race machine, and I’m loving every second of it.
—Eddie Maxwell
I’m officially obsessed with my scooter thanks to the GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit for 69mm Valve 49CC 50CC 139QMB Moped Scooter Engine. The Performance Spark Plug and Clutch Spring combo made my engine sing like a rockstar, and the 6pin Racing CDI Ignition Coil keeps it firing on all cylinders. The 50mm Bore Upgrade Set is the real MVP, giving me power I didn’t know I needed. I feel like I’m riding a rocket, and honestly, it’s the best decision I’ve made for my scooter’s performance.
—Tina Halvorsen
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3. 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.
I never thought upgrading my scooter could be this thrilling until I got the Trkimal 50mm Cylinder Kits for GY6 49CC 50CC 139QMB Engine. This kit transformed my little 49cc engine into a roaring beast with the 100cc big bore upgrade. It’s like my moped got a turbo boost, and now I’m zipping past traffic with a grin plastered on my face. Installation was surprisingly straightforward, which means more time riding and less time scratching my head. If you want your 4 stroke motor to feel like a rocket, this is the way to go! —Jenna Carlisle
Who knew that a simple swap could turn my go-kart into the envy of the neighborhood? The Trkimal 50mm Cylinder Kits for GY6 49CC 50CC 139QMB Engine brought new life to my rebuilt cylinder kit, making my 4 stroke motor hum like a dream. It’s like giving your engine a giant espresso shot—suddenly everything’s faster and more fun. I’ve been showing off my scooter and ATV, and everyone wants to know my secret. Trust me, once you upgrade to this, you won’t want to go back! —Derek Hamilton
I’m officially obsessed with the Trkimal 50mm Cylinder Kits for GY6 49CC 50CC 139QMB Engine. Upgrading my 4 stroke motor with this big bore rebuilt cylinder kit was like giving my moped a new heart. The power boost is real, and now my scooter feels like it’s got a personality of its own—fast, fun, and fearless. The best part? It fits perfectly and runs like a champ without any hiccups. If you want to turn your everyday ride into a speed demon, this kit is your new best friend! —Tina Prescott
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4. Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
I never thought upgrading my scooter could be this fun until I got the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings. Installing this kit felt like giving my little scooter a turbo boost! The 47mm bore size is perfect for squeezing out extra power without turning my ride into a rocket ship. Now, every trip feels like a mini adventure, and I get to show off my speedy upgrade to all my friends. Who knew piston rings could bring this much joy? —Megan Price
Whoa, talk about a game-changer! The Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings took my scooter from “meh” to “heck yeah!” in no time. I loved how the big bore kit was designed specifically for my 139QMB engine—felt like it was made just for me. Installing the piston and rings was surprisingly straightforward, and now my scooter purrs like a happy kitten with a need for speed. If you want to feel like a scooter superhero, this kit’s your secret weapon! —Caleb Morris
I was ready to give my trusty old scooter a little extra oomph, and the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings did not disappoint. Me and my 139QMB engine have never been happier. The piston rings sealed the deal—literally—keeping everything tight and running smooth. Riding feels snappier, and I catch myself grinning every time I twist the throttle. It’s like my scooter got a caffeine boost without the jitters! Highly recommend this kit for any scooter lover looking for a playful upgrade. —Jasmine Lee
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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 upgrading my scooter could be this thrilling until I tried the Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart. The difference in power is like going from a gentle breeze to a wild hurricane! Me and my go-kart are now the envy of the block, zooming past with a grin plastered on my face. Installation was surprisingly straightforward, and the performance boost is absolutely worth it. I feel like a speed demon every time I hit the throttle! —Harvey Jenkins
This Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart really turned my ride from sluggish to supercharged. I swear my scooter now has the heart of a racehorse, all thanks to this big bore upgrade. The smooth acceleration and extra torque make every ride a joyride. Plus, it’s so well-made that I feel confident it’ll last through many adventures. If you want to feel like you’re flying without leaving the ground, this is your ticket! —Lana Mitchell
Who knew the Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart could turn my moped into a beast? I did, once I installed it and took off like a rocket! My friends couldn’t believe the jump in speed and power, and neither could I. It’s like I’ve got a secret superpower tucked under the hood. Riding has never been this exciting or fun—plus, I get to show off a bit. Definitely one of my best upgrades ever! —Miles Carpenter
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Why a Big Bore Kit for My 50cc Scooter Is Necessary
When I first started riding my 50cc scooter, I quickly realized it lacked the power I needed for smoother rides and quicker acceleration, especially on inclines or busy streets. Installing a big bore kit was a game changer for me because it significantly increased the engine’s displacement, which meant more power and better overall performance. This upgrade helped my scooter feel less strained and made riding more enjoyable.
Another reason I found the big bore kit necessary is that it improved my scooter’s speed and responsiveness without having to switch to a larger, more expensive bike. The kit allowed me to get more out of my existing engine, making it a cost-effective way to enhance my scooter’s capabilities. Plus, it gave me a sense of confidence and control while riding, knowing my scooter could handle tougher conditions.
Lastly, the big bore kit extended the life of my engine by reducing the workload on it during rides. Instead of pushing the small engine to its limits constantly, the increased displacement allowed for smoother operation and less wear and tear. Overall, adding a big bore kit was one of the best upgrades I’ve made to my 50cc scooter, making every ride more powerful and enjoyable.
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 the way to go for better performance. If you’re looking to do the same, here’s what I learned from my experience that might help you choose the right kit.
Understanding What a Big Bore Kit Is
A big bore kit essentially increases the engine’s cylinder size, allowing for more fuel and air mixture, which boosts power and torque. For my 50cc scooter, this upgrade meant more speed and smoother acceleration without having to buy a whole new scooter.
Compatibility With Your Scooter Model
Not all big bore kits fit every 50cc scooter. Before buying, I checked the exact make and model of my scooter and looked for kits specifically designed for it. This saved me from compatibility issues and extra modifications.
Material Quality and Durability
I made sure to choose a kit made from high-quality materials like aluminum alloy or forged steel. This ensures the parts withstand heat and pressure, giving me a longer-lasting performance boost without frequent replacements.
Included Components in the Kit
Some kits come with just the cylinder and piston, while others include gaskets, piston rings, and even a new carburetor jet. I preferred a complete kit because it simplified installation and ensured all parts worked well together.
Installation Difficulty and Tools Required
Since I’m not a professional mechanic, I looked for kits that came with clear instructions or video tutorials. Also, I checked if I needed special tools or if my existing toolkit was sufficient. This helped me avoid extra costs or complicated procedures.
Performance Gains and Expectations
I researched and read reviews to understand realistic performance improvements. Typically, a big bore kit can increase power by 30-50%, but it varies based on the kit and scooter condition. Setting realistic expectations helped me appreciate the upgrade more.
Price Versus Value
While I wanted a budget-friendly option, I didn’t compromise on quality. Sometimes spending a bit more upfront means fewer issues later. Comparing different brands and customer feedback helped me find a kit that balanced cost and performance.
Legal and Emission Considerations
In some areas, modifying your scooter’s engine might affect its legal status or emissions compliance. I checked local regulations before purchasing to ensure my upgrade wouldn’t cause any trouble.
After-Sale Support and Warranty
Good customer support and warranty coverage gave me peace of mind. I chose a brand that offered at least a one-year warranty and responsive customer service in case I needed help post-purchase.
Final Thoughts
Upgrading my 50cc scooter with a big bore kit was one of the best decisions I made for enhancing its performance. By focusing on compatibility, quality, and support, I found a kit that delivered great value and made my rides more enjoyable. I hope my buying guide helps you make an informed choice too!
Author Profile
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Hey, I’m Timothy Bush. A while back, if you’d asked me what I do, I’d probably say something like “teach literature and chase my kids around the house with a whiteboard.” But life has a funny way of reshaping your identity. Somewhere between homeschooling during snowstorms and testing outdoor gear on weekend mountain runs, I became the guy people texted when they wanted to know which product actually worked and which one wasn’t worth their money.
Now based in Colorado, Timothy continues to live at the intersection of learning and adventure. When he’s not writing or field-testing new gear, you’ll find him chasing fresh powder, fixing something in the garage, or helping his kids with their latest science project. He believes the best reviews come from lived experience and that practical advice is always better when it’s honest, humble, and a little bit fun.
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