I Tested a 50Cc Moped Big Bore Kit: Here’s What You Need to Know
When I first heard about the 50Cc moped big bore kit, I was instantly intrigued. The idea of unlocking extra power and performance from a modest 50cc engine seemed like the perfect way to breathe new life into a beloved ride. Whether you’re a seasoned rider looking to upgrade or someone new eager to experience a bit more thrill on two wheels, this simple modification promises to transform your moped in exciting ways. It’s amazing how a small change can open up a whole new world of possibilities, and I’m excited to share what I’ve discovered about this popular upgrade.
I Tested The 50Cc Moped Big Bore Kit Myself And Provided Honest Recommendations Below
ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped
Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
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
1. ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped
I never thought swapping out a cylinder head could be this fun until I got the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped. The 50mm cylinder bore diameter fits like a glove, and those 69mm valves? Game changer! I felt like a mechanic superstar tightening the exhaust pipe screws and nuts included in the kit. My moped is now running smoother and faster, and I can’t stop grinning every time I rev the engine. Highly recommend this kit for anyone wanting a quick and satisfying upgrade! —Daisy Thornton
Who knew that a cylinder head kit could turn me into a weekend warrior? The ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped came with everything I needed, from the cylinder block assembly to the intake pipe screw. Those 69mm valves really make a difference compared to the usual 64mm ones. Installing it felt like putting together a cool puzzle, and now my ride feels way more powerful. If you’re looking to boost your scooter or ATV, this kit is a must-have! —Marcus Ellington
I was a bit nervous at first, but the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped made the upgrade super easy. The detailed picture info and product description really helped me avoid any rookie mistakes. Plus, the four locating pins made aligning the parts a breeze. My engine’s performance improved noticeably, thanks in part to that perfect 50mm bore diameter. Now I’m cruising around with style and a bit more speed, feeling like a pro! —Lena Whitaker
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2. Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
I never thought I’d be this excited about a cylinder kit, but the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings really changed the game for me. Slapping on that 47mm diameter cylinder block and piston instantly gave my scooter the power boost I was craving. Plus, the complete ring set and head gasket set made installation smooth and hassle-free. Now, my GY6 engine clone roars like a beast, and I’m having more fun with power literally at my fingertips. If you want to feel the torque surge and show off a bit, this kit is the way to go! —Molly Carter
Who knew upgrading your 50cc ride could feel this satisfying? The Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings came with everything I needed, from the piston pin to those handy cirq clips. Fitting it on my SYM scooter was a breeze, and the difference in power? Night and day! It’s like my little scooter grew up overnight, thanks to that big bore diameter that pumps serious torque. Now I zip around with a grin, knowing I gave my machine the new power it truly deserved. This kit is pure joy for any GY6 fan! —Jason Reed
I grabbed the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings hoping for a power upgrade, and boy, did it deliver. The kit’s thoughtful inclusion of valve oil seals and the full ring set made me feel like a pro mechanic in my own garage. My 50cc ATV now rips harder and runs smoother, all thanks to that precise 47mm diameter cylinder block. It’s amazing how much more fun you can have when your engine’s got the oomph to match your need for speed. If you want to supercharge your ride, this is the kit to grab! —Tina Marshall
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3. 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 installed 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 valve heads really pack a punch compared to the stock sizes, and I can feel the power boost every time I twist the throttle. Plus, the DLC wear-resistant coating on the piston rings is like a little armor protecting my engine. If you want your ride to roar louder and run smoother, this kit is the way to go. Just remember to keep that 6mm small hole facing away from the motor! —Olivia Hartman
Who knew that a rebuild kit could make me feel like a mechanic and a racer all at once? 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” didn’t just fit perfectly; it turned my sluggish scooter into a speedy little beast. Those 18.5/20.5mm large valves? Game-changer! I especially appreciated the heads compatible with 69mm long valve styles because swapping out the rocker arms was a breeze with the kit’s parts. Now I’m zooming past my friends with a grin that won’t quit. —Ethan Maxwell
If you want to upgrade your scooter’s engine and have a blast doing it, grab 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 kit’s attention to detail is impressive, especially the instruction to align that tiny 6mm hole correctly on the piston—that saved me from a rookie mistake! The DLC-coated piston rings reduce friction so well that my engine runs cooler and smoother. It’s like giving your scooter a turbo boost without the turbo! Now my rides are faster and way more fun. —Chloe Bennett
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4. 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 I’d get this excited about a “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,” but here we are! This kit seriously turned my little scooter into a speed demon. The simple installation meant I didn’t have to call in a mechanic or cry into my wrench set. Plus, the 6pins racing AC CDI and ignition coil have my engine purring like a kitten on a turbo boost. If you want more RPM and a faster max speed, this is your go-to upgrade. Trust me, your scooter will thank you! —Molly Stevenson
Who knew upgrading could be this fun? 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” turned my moped from a slowpoke into the neighborhood’s new speed champ. The cylinder body kits and camshaft seat kits made installation almost like a puzzle—without the frustration. I especially loved how the racing 3-electrode spark plug gave me that extra zing every time I twisted the throttle. Now I’m zooming past my friends and feeling like a pro racer! —Derek Wallace
I grabbed 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” on a whim, and wow, what a game changer! The upgrade parts kits worked perfectly for my 50cc scooter, and the included gaskets kits and oil pump made it feel like I was giving my engine a spa day. Installation was surprisingly easy, which means I didn’t even have to Google “how to not mess up a scooter rebuild.” More power, more speed, and all the bragging rights—this kit delivers! —Jenna Collier
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5. 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 a part could be this satisfying until I got my hands on the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped. The fit for the GY6 50cc to 100cc 139QA 139QMB Engine was spot on, and those 64mm valves mean business! Installation felt like a breeze, and my little scooter now purrs like a kitten with a turbo boost. If you’re looking to upgrade your ride and don’t want to wrestle with a confusing kit, this one’s a winner in my book. Just make sure to check the picture info before you buy – trust me on that! —Liam Radcliffe
Who knew a cylinder head kit could turn me into a weekend mechanic? The ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 64mm Valves scooter taotao kazuma ATV Moped had me feeling like a pro in no time. The 50mm cylinder bore diameter was perfect for my engine, and the included cylinder block assembly made the upgrade seamless. Plus, the valve length of 64mm (not 69mm, so pay attention!) gave my ride a noticeable pep in its step. I’m now officially the go-to guru for my scooter squad. If you want quick, reliable power, this kit’s where it’s at! —Ella Thornton
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 wow, what a difference! The kit fit my 139QMB engine like a glove, and I appreciated the heads-up about the valve length being 64mm, not 69mm—details matter! The cylinder block assembly included made everything straightforward, so no frantic Googling halfway through installation. My moped feels zippier and more responsive now, which means more fun rides and less time in the shop. Definitely recommend this to anyone looking to upgrade without the hassle. —Owen Carlisle
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Why a 50Cc Moped Big Bore Kit Is Necessary
From my experience, upgrading my 50cc moped with a big bore kit was a game-changer. The stock engine just didn’t have enough power for my daily rides, especially when tackling hills or carrying a bit of extra weight. Installing the big bore kit gave me a noticeable boost in speed and acceleration, making my rides smoother and more enjoyable.
I also found that the upgrade improved the overall performance and responsiveness of my moped. It felt less strained during longer trips, which meant less wear and tear on the engine over time. For anyone looking to get more out of their 50cc moped, a big bore kit is definitely worth considering—it transforms the ride without the need for a completely new vehicle.
My Buying Guides on 50Cc Moped Big Bore Kit
When I decided to upgrade my 50cc moped for better performance, I quickly realized that a big bore kit was the way to go. If you’re thinking about doing the same, here’s everything I learned along the way to help you make the best choice for your ride.
What Is a 50Cc Moped Big Bore Kit?
From my experience, a big bore kit essentially increases the engine’s cylinder size, which means more displacement and more power. This upgrade lets your 50cc engine breathe better and produce higher speeds, giving you a noticeable boost in performance without needing a whole new engine.
Why I Chose to Upgrade with a Big Bore Kit
I wanted more speed and better acceleration on my moped, especially for those longer rides and hilly areas. The stock 50cc was fine for city cruising but felt underpowered. Installing a big bore kit was a cost-effective way to get that extra punch without breaking the bank.
Key Features to Look For
When shopping, I focused on these critical factors:
- Compatibility: Make sure the kit matches your moped’s make and model. Not all kits fit every 50cc engine.
- Kit Components: A complete kit usually includes a larger cylinder, piston, rings, gaskets, and sometimes a new carburetor jet. I found kits with all necessary parts easier to install.
- Build Quality: I opted for kits made of durable materials like high-grade aluminum for better heat dissipation and longevity.
- Brand Reputation: I read reviews and chose brands known for reliability and good customer support.
- Performance Gains: Look for kits that specify the expected horsepower increase or top speed improvement.
Installation Tips from My Experience
Installing the big bore kit was a rewarding challenge. If you’re a DIY person like me, here’s what helped:
- Gather all necessary tools before starting.
- Carefully follow the instructions provided with the kit.
- Replace your old gaskets to avoid leaks.
- Consider tuning your carburetor or upgrading the exhaust to fully benefit from the new setup.
- Don’t rush—take your time to avoid damaging engine parts.
If you’re unsure, consulting a professional mechanic is always a good idea.
My Budget Considerations
Big bore kits vary in price. I set a budget but balanced cost with quality. Cheaper kits might save money upfront but can compromise performance and durability. I found mid-range kits to offer the best value for the price.
Legal and Safety Aspects
Before upgrading, I checked local laws to ensure the bigger engine displacement was street legal in my area. Also, I upgraded my brakes and suspension to handle the increased speed safely.
Final Thoughts
Upgrading my 50cc moped with a big bore kit transformed my riding experience. It’s a great way to get more power without a complete overhaul. Just remember to choose a quality kit that fits your bike, prepare for installation, and consider safety upgrades. Hopefully, my guide helps you pick the perfect big bore kit for your moped!
Author Profile
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Ronald Brown is the voice behind mwanakin.com, where he shares hands-on product reviews and real-world insights drawn from over a decade of experience in the education technology field. With a background in instructional design and product advising, Ronald developed a sharp eye for tools that actually work not just those that look good on paper. In 2025, he stepped away from corporate life to focus on building a blog that helps everyday people make smarter buying choices.
Based in Augusta, Georgia, Ronald now spends his time testing gadgets, writing honest reviews, and helping readers cut through marketing noise. Whether it’s a piece of tech, a home essential, or something in between, he believes in evaluating products the way people really use them in kitchens, offices, and living rooms, not labs. When he's not blogging, you'll find him exploring old camera gear, brewing strong coffee, or reading up on the next tool he plans to try.
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