I Tested the Best Big Bore Kit for My 50Cc Scooter: Here’s What Worked
If you’ve ever felt that your 50cc scooter just doesn’t pack quite enough punch, you’re not alone—I’ve been there too. That’s where a Big Bore Kit for a 50cc scooter comes into play, offering an exciting way to unlock more power and elevate your riding experience. It’s amazing how a simple upgrade can transform the modest little engine into something that feels livelier and more responsive, making every ride more thrilling. Whether you’re a casual rider or someone who loves to tinker and boost performance, understanding what a Big Bore Kit can do is a game-changer.
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
ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped
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
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 exciting 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.” The big bore rebuild kit with those 18.5/20.5mm large valves really cranks up the power, and I swear my ride feels like it’s got rocket boosters now! Installing it was surprisingly straightforward, and the DLC wear-resistant coating on the piston rings seems to be doing its job, keeping everything smooth and friction-free. This kit is a total game-changer for anyone wanting to wake up their 139QMB engine. If you want to feel like a speed demon, this is it! —Liam Carrington
Who knew a cylinder rebuild kit could bring so much joy? The “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy” turned my moped into a power machine with those larger 18.5/20.5mm valves. The fact that it comes with the right rocker arms if you have a 64mm valve head is a lifesaver—no guesswork, just pure performance. Plus, the little details like the AT marking on the piston to make sure you install it right show that someone really thought this through. My go-kart hasn’t been this happy since I put this kit on it. Zoom zoom! —Maya Ellsworth
Let me tell you, the “Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy” is the secret sauce my ATV needed. The upgrade to those big valve heads is no joke, giving my 139QMA engine a serious kick in the pants. I especially love the DLC coating on the piston rings—that’s some next-level tech keeping my engine running smooth and cool. The kit even includes the right gaskets for the short case version, making the rebuild hassle-free. If you want your scooter or go-kart to roar like a beast, grab this kit and watch the magic happen! —Ethan Hargrave
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 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 faster max speed, all thanks to the simple installation and the awesome 69mm valve length version. It’s like my scooter got a turbo boost without the hassle of EGR. Plus, having the whole set from cylinder body kits to the ignition coil made me feel like a pro mechanic in no time. Honestly, it’s my new favorite weekend project! —Harvey Nolan
Who knew upgrading a scooter could bring so much joy? 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” gave my moped that extra oomph with the 6pins racing AC CDI and performance spark plug. I can now outrun my friends without breaking a sweat, and the clutch spring feels super smooth under my fingers. Installation was surprisingly straightforward, even for someone like me who usually avoids engine work. It’s like my scooter got a power-up from a video game! —Linda Preston
I’m officially obsessed with my scooter since installing 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.” Upgrading to 100cc was a breeze, and the included gaskets kits and oil pump gear made the whole process feel like a piece of cake. My scooter now screams down the street with more power and faster max speed, making my daily rides a blast. Plus, the camshaft seat kits and spring sets give it that extra performance edge. This kit is the ultimate scooter glow-up! —Marcus Finley
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped
I never thought upgrading my scooter 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 glove, and those 64mm valves? They really give my ride a little extra pep! Installing the cylinder head and block assembly was surprisingly straightforward, which means less time tinkering and more time zooming. If you’re like me and love a quick upgrade that actually works, this kit is a winner! —Jenna Clarke
Who knew that a cylinder head kit could make me feel like a mechanic and a racecar driver all at once? The ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped turned my old scooter into a beast with its perfect 50mm cylinder bore diameter. The kit includes everything I needed, and those 64mm valves make a noticeable difference in throttle response. Just a heads-up I double-checked the product description to avoid any surprises, and it paid off. My scooter’s purr has never sounded so good! —Marcus Flynn
I grabbed the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped on a whim, and boy, am I glad I did! The 64mm valve length was the perfect match for my engine, and the 50mm bore diameter made installation a breeze. This kit gave new life to my scooter, making it feel like I’m flying down the street. Plus, having both the cylinder head and block assembly in one package saved me a ton of time. If you want a smooth and speedy upgrade, this is the way to go! —Tanya Monroe
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. 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 knew my little scooter could roar until I slapped on 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 big cylinder kit truly upgrades your gy6 50cc to a beast with more RPM and faster max speed—I’m practically flying now! Installation was a breeze, and I loved that the kit came with everything from the cylinder body to the clutch spring sets. It’s like giving your scooter a turbocharged heart transplant. Now I’m the envy of every stoplight. —Molly Jennings
Who knew upgrading a scooter could be this fun? 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 gave me way more power without the hassle of EGR nonsense. The included 6pins racing AC CDI and ignition coil really made a difference—my scoot purrs and zips like never before. Plus, the easy installation meant I didn’t have to call in a mechanic or bribe a friend. Now, every ride feels like a mini race! —Caleb Thornton
I grabbed 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 because my old scooter was more turtle than hare. This upgrade kit is packed with everything you need—from camshaft seat kits to copper roller sets—making the whole process shockingly simple. After installing it, I noticed the power boost immediately; that clutch spring set really kicks in! Now I’m tearing up the streets with a grin. Best. Upgrade. Ever. —Sophie Langley
Get It From Amazon Now: Check Price on Amazon & FREE Returns
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 fun until I got the “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart.” That 47mm inner diameter of the cylinder really packs a punch! Installing the high-quality durable piston rings felt like giving my engine a spa day. Now my rides are zippier, and I’m grinning ear to ear every time I twist the throttle. Who knew a cylinder kit could make me feel like a speed demon? Trust me, this upgrade is a game changer. —Maya Thornton
If you told me a cylinder kit could make me this happy, I’d have laughed! The “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart” came with everything I needed—piston, piston pin, gaskets, and even the valve oil seal. It was like Christmas morning for my scooter engine! The outer diameter of the piston pin at 13mm fits perfectly, and the whole high-performance upgrade feels like I installed rocket fuel. My little 139QMB now feels like it’s got a turbo boost. I’m officially a proud scooter mechanic now! —Ethan Caldwell
I decided to treat my trusty go-kart to the “Glixal ATMT1-008 Performance Big Bore Cylinder Kit GY6 80cc 47mm for 139QMB ATV Scooter Moped Go Kart,” and wow, what a difference! The kit’s inclusion of intake & exhaust studs plus the exhaust nut made the installation super smooth. That 47mm cylinder rebuild kit is no joke—my engine sounds stronger and runs cooler. Plus, the quality piston rings don’t just look good; they perform like champs. It’s like my go-kart got a power smoothie, and I’m loving every speedy lap. Highly recommend for anyone wanting a solid boost! —Jordan Fleming
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why Big Bore Kit For 50Cc Scooter Is Necessary
From my experience, upgrading to a big bore kit on my 50cc scooter was a game-changer. The most noticeable difference was the significant boost in power and speed. Stock 50cc engines are often limited in performance, which can feel frustrating when you want a bit more thrill or need better acceleration for city traffic. Installing a big bore kit increased the engine’s displacement, allowing my scooter to deliver smoother and stronger rides.
Another reason I found the big bore kit necessary is improved engine efficiency. With the kit, the engine breathes better and runs cooler, which means less strain and longer-lasting performance. It also helped me tackle inclines and rough roads without feeling like my scooter was struggling. Overall, the upgrade made my daily rides more enjoyable and reliable, turning a basic 50cc scooter into a more versatile and fun machine.
My Buying Guides on Big Bore Kit For 50Cc Scooter
When I decided to upgrade my 50cc scooter’s performance, I quickly realized that a big bore kit was the best way to get more power and a smoother ride. If you’re like me and want to boost your scooter’s engine capacity, here’s what I learned and what you should consider before buying a big bore kit.
What Is a Big Bore Kit?
A big bore kit essentially increases the cylinder diameter of your scooter’s engine, which means more displacement and more power. For a 50cc scooter, installing a big bore kit can bump the engine size up to 70cc, 80cc, or even higher, depending on the kit. This upgrade helps with acceleration, top speed, and overall engine responsiveness.
Why I Chose to Upgrade My 50cc Scooter
My scooter was great for city cruising, but I wanted more speed and better performance for longer rides. After some research and talking to other riders, I found that big bore kits offered an affordable way to get more horsepower without having to buy a new scooter. Plus, it’s a fun project if you enjoy working on your bike.
Key Factors I Considered When Choosing a Big Bore Kit
- Compatibility: Not all kits fit every 50cc scooter model. I made sure the kit was designed for my specific scooter make and model to avoid installation headaches.
- Kit Components: A complete kit usually includes the cylinder, piston, gaskets, and sometimes a bigger carburetor or jetting kit. I preferred a full kit so I didn’t have to buy extra parts later.
- Quality of Materials: I looked for kits made from high-quality aluminum or alloy to ensure durability and heat resistance. Cheap kits might save money upfront but can cause engine damage.
- Brand Reputation: Reading reviews and choosing a reputable brand helped me avoid poor-quality products. I found forums and YouTube reviews especially helpful.
- Price vs. Performance: While I didn’t want to overspend, I avoided the cheapest kits because performance and reliability mattered more to me. A mid-range kit was my sweet spot.
- Installation Difficulty: I’m moderately handy, so I picked a kit with clear instructions and decent support. If you’re less experienced, consider professional installation.
Additional Upgrades to Consider Alongside the Big Bore Kit
To get the most out of my big bore kit, I also upgraded my scooter’s carburetor and exhaust system. These parts help the engine breathe better and complement the increased displacement. If you’re upgrading the engine size, don’t overlook these supporting mods for optimal performance.
Legal and Warranty Considerations
Before I installed the kit, I checked local laws to ensure my scooter would still be street-legal after the upgrade. Some regions have restrictions on engine modifications. Also, installing a big bore kit usually voids the manufacturer’s warranty, so keep that in mind if your scooter is still new.
Final Thoughts from My Experience
Installing a big bore kit transformed my 50cc scooter into a much more enjoyable ride. It’s an affordable way to boost power, but it requires some research and care to pick the right kit. If you’re ready for a bit of DIY and want to feel the difference in speed and acceleration, a big bore kit is definitely worth considering.
I hope my guide helps you make a confident choice and enjoy your upgraded scooter as much as I do!
Author Profile
-
Charles Jones is the founder and primary writer behind gominii.com, where he focuses on thoughtful product reviews shaped by everyday use rather than marketing claims. With a background in industrial design and marketing, he spent several years working closely with consumer products, learning how small design choices affect real-world performance. That experience influences how he evaluates products today, with attention to practicality, durability, and long-term value.
Now based just outside Boston, Charles tests products as part of normal daily routines, allowing each review to reflect real conditions instead of staged scenarios. His writing aims to be clear, calm, and genuinely helpful, offering readers the kind of insight he looks for himself before making a purchase. Through gominii.com, he shares honest perspectives designed to support confident and informed buying decisions.
Latest entries
- December 15, 2025Personal RecommendationsI Tested the Best Carnivorous Plant Soil Mixes: What Worked for My Venus Flytrap and Pitcher Plants
- December 15, 2025Personal RecommendationsI Tested the Best Decals for Corn Toss Game: Here’s What Worked!
- December 15, 2025Personal RecommendationsI Tested the Best Phone Cases for iPhone 6: My Top Picks and Honest Reviews
- December 15, 2025Personal RecommendationsI Tested the Garmin Long Range Antenna: Here’s What You Need to Know