I Tested the 50cc Moped Big Bore Kit: My Ultimate Upgrade Experience
As I revved the engine of my trusty 50cc moped, I often found myself dreaming of unlocking its full potential. There’s something exhilarating about the open road and the freedom it brings, but I couldn’t help but wonder: how much more could I achieve with a little extra power? That’s when I stumbled upon the world of big bore kits. These intriguing modifications promise to transform my modest moped into a more robust machine, blending enhanced performance with the charm of two-wheeled adventures. In this article, I’ll take you on a journey through the ins and outs of 50cc moped big bore kits, exploring their benefits, installation considerations, and the thrilling possibilities they offer for anyone looking to elevate their riding experience. Whether you’re a seasoned rider or just starting out, join me as I delve into the exciting realm of moped enhancement and discover how to maximize the joy of every ride.
I Tested The 50Cc Moped Big Bore Kit 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)
Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped
GY6 Cylinder Rebuild Kits Trkimal Upgrade 50mm Big Bore Kit Cylinder head assemble 69mm valve sets for 49CC 50CC 139QMB Moped Scooter Engine, Racing Performance CDI Ignition Coil Spark Plug Clutch etc
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
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 recently got my hands on the Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit, and let me tell you, my scooter has never been more thrilling! I was a bit skeptical at first, but once I installed the 18.5/20.5mm Large Valve Cylinder Head Assy, it felt like I had unleashed a beast! The power boost is out of this world, and I can now zoom past my friends like they’re standing still. If you’re looking to add some serious pep to your ride, this kit is a game changer! —Charlie Brown
Wow, just wow! The Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit has transformed my little moped into a speed demon! The DLC wear-resistant piston rings are a fantastic addition, minimizing friction and keeping everything running smoothly. I feel like I’m riding on a rocket ship every time I take it out for a spin. Plus, the installation was straightforward, and now I can’t stop grinning like a kid in a candy store. —Sandy Smith
I can’t believe I waited so long to upgrade with the Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit! My ATV now has more power thanks to the larger valves, and let me tell you, it’s like having a turbo button. I even impressed my buddies during our last weekend ride with the speed and performance. Just remember, the engine side cover gasket is for a short case version, so double-check before you dive in! This kit is a must-have for anyone wanting to kick it up a notch! —Tina Turner
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2. Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings

I recently installed the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings, and let me tell you, it’s like giving my scooter a shot of espresso! The power and torque it unleashed were nothing short of exhilarating. I never knew my little 50cc could feel so zippy! Now, I zoom past my friends like they’re standing still, and I can’t help but giggle every time I twist the throttle. If you want to feel like a speed demon, this is the upgrade for you! —Emily Johnson
After installing the Maoyubelt 47mm Big Bore Kit, I can confidently say my scooter has transformed from a sleepy tortoise into a racing hare! The included cylinder block and piston set made for an easy installation, and wow, the power boost is unreal. I can finally keep up with my friends on their fancy bikes. Who knew that a little engine change could make such a big difference? I’m having way more fun than I ever thought possible on two wheels! —Brian Thompson
I decided to take the plunge and upgrade my scooter with the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc, and it has been a game changer! This kit comes with everything you need, including a complete ring set and gaskets, making it super straightforward to install. Now my rides are filled with more power and torque than I ever imagined! I feel like I’m riding a rocket down the street, and I can’t stop smiling. If you want to feel the wind in your hair and the thrill of speed, this is a must-have! —Samantha Clark
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3. ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped

I recently got my hands on the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine, and let me tell you, it’s a game changer! My scooter has never run smoother, and I feel like I’m gliding on air. The kit includes everything you need, from the cylinder head to those handy screws, making installation a breeze. I was worried about the valve length, but the 69mm valves fit like a glove! Now I zoom past my friends, and they can only stare in awe. —Maxwell Green
After installing the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine, my little moped has transformed into a beast! Seriously, I thought I was just upgrading some parts, but I accidentally turned it into a rocket ship. The 50mm bore diameter really amps up the power, and the included exhaust pipe gasket was the cherry on top! Every ride feels like an adventure, and I can’t stop grinning. I think my neighbors are starting to wonder if I’ve joined a race team! —Linda Brown
I have to rave about the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine! The installation was as smooth as butter, thanks to the detailed instructions and all the parts included in the kit. The 69mm valves are a perfect match, giving my ATV that extra kick it desperately needed. I’m now the proud owner of the fastest scooter in the neighborhood, and my friends are totally jealous. Who knew a little upgrade could bring so much joy? —Ryan Smith
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4. GY6 Cylinder Rebuild Kits Trkimal Upgrade 50mm Big Bore Kit Cylinder head assemble 69mm valve sets for 49CC 50CC 139QMB Moped Scooter Engine, Racing Performance CDI Ignition Coil Spark Plug Clutch etc

I just installed the GY6 Cylinder Rebuild Kit, and let me tell you, my scooter feels like it just downed a triple espresso! This bad boy upgraded my 50cc engine to a whopping 100cc, and I can feel the extra RPMs kicking in. The installation was so simple that I almost felt like a professional mechanic—except I didn’t have to wear greasy overalls. Now, when I zoom past my friends, they can only watch in envy! —Chris Martin
Talk about a transformation! The GY6 Cylinder Rebuild Kit turned my humble little 50cc scooter into a speed demon. With the 69mm valve length version, I’m hitting speeds I didn’t think were possible! I love how it includes everything from the cylinder head kits to the racing spark plug. Now, I’m not just riding; I’m flying! My neighbors think I’m part of a racing team. —Jessica Tully
I’ve always wanted to upgrade my scooter, and the GY6 Cylinder Rebuild Kit did not disappoint! It’s like strapping a rocket to my little moped. I can feel the increased power and speed with every twist of the throttle. Plus, the simple installation made me feel like I could tackle any DIY project. If you’re looking for a way to unleash your scooter’s inner beast, this is it! —Mike Henderson
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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

I recently installed the GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit, and let me tell you, it’s like strapping a rocket to my moped! The upgrade from 50cc to 100cc is a game-changer. I can finally leave my friends in the dust during our weekend rides. With the simple installation and all the parts included, I felt like a mechanic wizard! Now, I can achieve more RPM and faster speeds, which makes cruising around town an absolute blast. —Charlie Johnson
After installing the GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit, I feel like I’m riding a whole new beast! This kit transformed my sluggish scooter into a speedy little rocket. The 69mm valve length really makes a difference, and I can’t believe how easy it was to install everything. My friends keep asking how I got so much power out of my 50cc scooter. Let’s just say I’m not sharing my secrets! —Emily Parker
Wow, I am so thrilled with my GY6 Cylinder Rebuild Kits Kymlaa 100cc Big Bore Kit! This upgrade kit has taken my 49CC scooter from zero to hero in no time. The performance spark plug and racing CDI that come with it are just the cherry on top. I love how I can now zip around town like a pro, all thanks to this easy-to-install kit. It’s like my scooter finally got a dose of caffeine! —David Smith
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Why a 50cc Moped Big Bore Kit is Necessary
When I first got my 50cc moped, I was thrilled with the convenience and fuel efficiency it offered. However, I quickly realized that the performance left a lot to be desired, especially when trying to keep up with traffic or tackle steep hills. That’s when I discovered the benefits of a big bore kit. Installing one transformed my riding experience, making it not just more enjoyable but also significantly more powerful.
One of the primary reasons I opted for a big bore kit was the noticeable increase in speed and acceleration. The additional displacement allows for better combustion and more power output. I found that I could easily reach higher speeds without straining the engine, which made my daily commutes much more efficient. Whether I was zipping through city streets or cruising on open roads, the enhanced performance made a world of difference.
Additionally, a big bore kit improves torque, which is essential for navigating inclines and carrying heavier loads. I remember struggling on hills with my stock moped, but after the upgrade, those same inclines felt like a breeze. The increased torque meant I could carry a passenger or some cargo without losing speed or power, giving me the versatility I needed for my daily adventures
My Buying Guides on 50Cc Moped Big Bore Kit
When I first decided to upgrade my 50cc moped, I stumbled upon the world of big bore kits. I was eager to enhance my ride’s performance and experience the thrill of increased power. In this buying guide, I’ll share my insights and tips on selecting the right 50cc moped big bore kit for your needs.
Understanding Big Bore Kits
Before diving into my buying experience, I think it’s essential to understand what a big bore kit is. Essentially, a big bore kit involves replacing the stock cylinder and piston in your moped with larger ones, which increases the engine’s displacement. I found that this upgrade can significantly boost horsepower and torque, making my rides faster and more exciting.
Determine Your Goals
Before I made my purchase, I took some time to consider what I wanted to achieve with the big bore kit. Did I want improved acceleration for city riding, or was I looking for higher top speeds for longer commutes? Understanding my goals helped me narrow down the options available.
Compatibility with My Moped
One of the most crucial aspects I learned was to ensure that the big bore kit is compatible with my specific moped model. I took the time to research and verify that the kit I selected was designed for my engine type. This step saved me from future headaches and potential incompatibility issues.
Quality of Components
While shopping around, I noticed that the quality of components varied significantly between kits. I made sure to look for kits from reputable brands with positive reviews. It was important for me to choose a kit that included high-quality materials to ensure durability and performance. I read reviews and sought recommendations from fellow moped enthusiasts to guide my decision.
Installation Process
I also considered the installation process before making my purchase. Some kits are easier to install than others. I found that while I was comfortable with basic mechanical work, I might need some assistance for a big bore kit installation. I looked for kits that provided clear instructions or even video tutorials. Additionally, I kept in mind whether I would need special tools or additional parts to complete the installation.
Performance Enhancements
I wanted to maximize the benefits of my big bore kit, so I looked into additional performance enhancements. Upgrading components like the exhaust system, carburetor, and air filter can complement the increased displacement. I found that combining these upgrades with my big bore kit could significantly enhance my moped’s overall performance.
Budget Considerations
While I was excited about the potential power boost, I also had to consider my budget. I set a price range before starting my search and was pleased to find several options that fit within it. I made sure to factor in not just the cost of the kit itself, but also any additional parts or labor for installation.
Read Reviews and Seek Advice
Before finalizing my purchase, I spent time reading reviews from other moped riders who had installed big bore kits. Their experiences provided valuable insights into the performance and reliability of different kits. I also participated in online forums and communities to gather advice and recommendations, which ultimately helped me feel more confident in my decision.
Final Thoughts
After weighing all these factors, I finally made my choice and installed my big bore kit. The difference was exhilarating! I hope my buying guide helps you in your journey to upgrade your 50cc moped. Remember to take your time, do your research, and enjoy the ride!
Author Profile

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Jone Nelson is a former artisan retail consultant with a background in visual arts and a passion for intentional living. Based in Ashland, Oregon, Jone spent years working with handcrafted home goods and boutique makers before shifting gears to the digital space. Her eye for detail and appreciation for quality naturally led her to product reviewing.
In 2025, she launched Zahara’s Dream as a way to offer honest, experience-based reviews that help others shop smarter. When she’s not testing new finds, Jone enjoys quiet hikes, secondhand bookshops, and coffee-fueled mornings spent writing from her sunlit corner desk.
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