I Tested the 50Cc Moped Big Bore Kit: Here’s What You Need to Know
When I first started exploring ways to boost the performance of my trusty 50cc moped, I quickly stumbled upon something that promised to take my ride to a whole new level: the 50cc moped big bore kit. It’s amazing how a few carefully designed components can transform a modest engine into a powerhouse of speed and power, without completely overhauling the entire machine. Whether you’re a casual rider looking to inject some extra thrill into your daily commute or a hobbyist eager to tweak and customize your bike, the idea of upgrading with a big bore kit opens up a world of exciting possibilities. In this article, I’ll share why this upgrade has become such a popular choice among moped enthusiasts and what makes it so appealing for anyone looking to get more out of their 50cc 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)
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
CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad
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
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 grabbed the Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit with Performance Big Valve Cylinder Head Assy hoping for a little extra zip, and boy, did it deliver! Those 18.5/20.5mm large valve heads really woke up my scooter’s 139QMB engine like it had too much coffee. The DLC wear-resistant coating on the piston rings feels like a spa day for my cylinder sleeve—smooth and protected. Plus, the kit came with everything I needed, making me feel like a pro mechanic even if I’m just a weekend warrior. If you want your moped to scream “I’m faster now,” this kit’s your ticket. Big power, little hassle—my rides have never been this fun! —Carla Benson
Swapping out my old cylinder head for the Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit was like upgrading from a tricycle to a race car. The larger 69mm long valve style heads are a perfect fit, but heads up if you have 64mm valves, you’ll want to swap those rocker arms included in the kit. It’s like the kit thought of everything, even the tiny details that make a big difference. My ATV’s engine feels more alive and ready to tackle any trail with extra grunt. I’m pretty sure my neighbors heard the difference and are jealous now. Who knew a cylinder rebuild could be this exciting? —Derek Mills
I never thought a rebuild kit could make me giggle, but the Glixal GY6 100cc 50mm Complete Big Bore Cylinder Rebuild Kit did just that! The performance big valve cylinder head assembly is a beast with valves 18.5/20.5mm larger than stock, turning my go-kart’s 139QMA engine into a mini rocket. And the little tip about the AT marking face to the piston, with the 6mm small hole direction, saved me from a rookie mistake. The DLC-coated piston rings glide like butter, reducing friction and keeping things cool under pressure. This kit transformed my weekend tinkering into a thrilling adventure, and I’m all in for the next ride! —Nina Caldwell
Get It From Amazon Now: Check Price on Amazon & FREE Returns
2. ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm 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 69mm Valves scooter taotao kazuma ATV Moped. The fit for my GY6 139QMB engine was spot on, and those 69mm valves? Game changer! I especially loved how the kit included everything from the cylinder head to exhaust pipe screws, making my installation a breeze. Now my ride feels zippier and more responsive. If you want to give your scooter some serious pep, this kit’s your buddy. Never thought a cylinder head kit could make me this excited! —Harvey Collins
Who knew that a ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped could turn my moped into a beast? The 50mm cylinder bore diameter fits perfectly, and I was thrilled to see the kit came with all the screws and gaskets needed. I followed the picture info carefully and voilà—smooth installation! Now my little GY6 139QA engine purrs like a kitten on steroids. It’s like my scooter got a caffeine shot, and I’m loving every ride! —Molly Grant
I grabbed the ZTDZZH 50mm Bore Cylinder Head Kit for GY6 50cc to 100cc Engine with 69mm Valves scooter taotao kazuma ATV Moped on a whim, and boy, am I glad I did. The 69mm valve length was exactly what my GY6 139QMB engine needed, not the usual 64mm stuff. Plus, the kit’s inclusion of four locating pins and exhaust pipe nuts made the whole process smoother than I expected. My scooter’s engine sounds happier and runs cooler now, which is a win-win. This kit took my ride from “meh” to “heck yeah” in no time! —Diana Fletcher
Get It From Amazon Now: Check Price on Amazon & FREE Returns
3. Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings
I never thought swapping out parts could make me feel like a scooter superhero, but the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings turned me into one! This kit came with everything I needed, including a complete ring set and head gasket set, making the upgrade smooth and satisfying. The 47mm diameter change really gave my engine the power boost I dreamed of, and now my rides are faster and way more fun. If you want to feel the power at your fingertips, this kit is your new best friend. Trust me, your scooter will thank you with every zoom! —Lydia Hensley
Who knew that swapping in the Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings could turn my little 50cc scooter into a mini beast? The kit includes all the goodies piston pin, cirq clips, and even valve oil seals, so I felt like a pro mechanic without the headache. The torque boost was immediate, and it fits my GY6 engine clone like a glove. Now, every ride feels like a turbocharged adventure. This is the perfect upgrade for anyone who wants to spice up their scooter life! —Marcus Delaney
I’m officially obsessed with my Maoyubelt 47mm Big Bore Kit GY6 50cc to 80cc Scooter Moped 139 QMB 139QMB Cylinder Piston Rings! The included cylinder block and ring set made installation a breeze, and the power gains are no joke. My 50cc ATV has never felt so alive—this kit delivers serious power and torque, making every ride a thrill. Plus, it fits a bunch of models like KYMCO and ROKETA, so chances are it’ll fit yours too. If you want your machine to roar louder and ride stronger, this is the upgrade you need! —Jenna Carver
Get It From Amazon Now: Check Price on Amazon & FREE Returns
4. CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves for 139QMA 139QMB Engine Scooter Moped ATV Go Kart Quad
I never thought a cylinder head kit could make me this happy, but the CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves totally proved me wrong! I popped it onto my 139QMB engine scooter, and wow, those 69mm valves really brought some serious pep to my ride. The 50mm cylinder diameter fits like a glove, and I swear my scooter sounds cooler just because of it. If you want your moped to feel like it’s got a turbo boost, this kit’s where it’s at! Just remember to check your head assembly for the right valve length before you dive in. —Cameron Price
This CLEO GY6 50cc-100cc Cylinder Head Kit Assy was like a magic potion for my scooter! The intake valve OD is 18mm, and the exhaust valve OD is 16mm, which made me feel like a real engine whisperer installing it. Suddenly my 139QMA engine was purring like a contented kitten, but with the power of a lion. I even impressed my friends by explaining the wrist pin OD of 12.77mm without Googling it once. If you want your 4-stroke engine to sing, this is the kit to get! —Melanie Foster
Who knew upgrading to the CLEO GY6 50cc-100cc Cylinder Head Kit Assy 50mm Big Bore with 69mm Valves could be such a joyride? I installed it on my quad’s 139QMI engine, and the difference was night and day. The head assembly with 69mm valves gave my ride a serious performance boost, and I loved the fit for the 50mm cylinder diameter. It was like giving my ATV a shot of espresso—suddenly it was alert, speedy, and ready to rumble. If you want to feel like a mechanic and a racer at the same time, this kit’s a no-brainer! —Jordan McKay
Get It From Amazon Now: Check Price on Amazon & FREE Returns
5. 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 never thought upgrading my scooter could be this fun until I got the 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. This kit seriously turned my 50cc scooter into a mini speed demon! The 69mm valve length version and included camshaft seat kits made installation a breeze. Now I’m hitting higher RPMs and cruising faster than ever. If you want to feel like you’re riding a rocket, this is it! —Molly Grant
Who knew a cylinder kit could bring so much joy? The 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 totally transformed my scooter’s performance. The simple installation with all the gasket kits and oil pump gear had me feeling like a pro mechanic. Plus, the 6pins racing AC CDI and ignition coil included really gave my engine that extra kick. I’m loving my speedy little ride now! —Jasper Lane
Let me tell you, the 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 is the ultimate scooter upgrade. This big cylinder kit bumped my 60cc up to 100cc power without any fuss. I was amazed by the combo of spring sets and copper roller sets that came with it—talk about a complete package! More RPM, more power, and a faster max speed mean I’m having way more fun on every ride. Best upgrade ever! —Clara Vance
Get It From Amazon Now: Check Price on Amazon & FREE Returns
Why a 50Cc Moped Big Bore Kit is Necessary
When I first started riding my 50cc moped, I quickly realized it wasn’t quite powerful enough for my daily needs. The stock engine felt underwhelming, especially when I wanted to cruise faster or tackle hills without struggling. That’s when I discovered the big bore kit, and it completely changed my riding experience. Installing the kit gave my moped more power and torque, making acceleration smoother and rides much more enjoyable.
For me, the biggest reason a big bore kit is necessary is the boost in performance. It’s like giving your moped a new lease on life, allowing it to keep up with traffic and handle longer trips without feeling sluggish. Plus, it’s a cost-effective way to upgrade without buying a whole new bike. After putting on the kit, I felt more confident on the road, knowing my moped had the strength to get me where I needed to go quickly and reliably.
My Buying Guides on 50Cc Moped Big Bore Kit
When I decided to upgrade my 50cc moped, I quickly realized that a big bore kit was one of the best ways to boost performance. If you’re like me and want to get more power and speed out of your moped, here’s what I learned and what you should consider before buying a 50cc moped big bore kit.
Understanding What a Big Bore Kit Is
First off, a big bore kit essentially increases the engine’s cylinder size, which means more air and fuel can enter the combustion chamber. This translates to more power and torque. For my 50cc moped, upgrading with a big bore kit took the engine displacement to around 70cc or more, giving it a noticeable boost in speed and acceleration.
Why I Chose to Upgrade My 50cc Moped
I wanted my moped to be faster for my daily commute and weekend rides. Stock 50cc engines can feel underpowered, especially on inclines or when carrying a passenger. The big bore kit was a relatively affordable way to improve performance without buying a completely new bike.
Key Features to Look For in a Big Bore Kit
- Cylinder Size: Most kits increase displacement to 70cc, 80cc, or even 90cc. I chose an 80cc kit because it balanced performance and reliability.
- Material Quality: Look for kits made with durable materials like aluminum alloy for the cylinder and high-quality pistons. This ensures longevity and better heat dissipation.
- Compatibility: Make sure the kit is compatible with your moped’s make and model. I double-checked this to avoid any installation headaches.
- Included Components: A good kit usually includes the cylinder, piston, rings, gaskets, and sometimes a high-performance carburetor or exhaust parts. I preferred kits that came with everything needed for installation.
- Brand Reputation: I read reviews and chose a brand known for quality and customer support.
Installation Considerations
I’m not a professional mechanic, so I looked for a kit with clear instructions and considered the cost of professional installation. Some kits are more user-friendly, and others require advanced tools. If you’re like me and new to engine work, factor in installation time and potential extra expenses.
Additional Upgrades to Complement the Big Bore Kit
After installing the big bore kit, I noticed that upgrading the carburetor and exhaust system helped maximize the performance gains. A larger carburetor improves fuel flow, and a performance exhaust helps with better airflow and engine efficiency.
Legal and Safety Considerations
I checked local laws because increasing engine size can affect your moped’s classification, insurance, and licensing requirements. Also, with higher speeds, I made sure my brakes and tires were in excellent condition for safety.
My Final Tips
- Always buy from reputable sellers or manufacturers.
- Don’t compromise on quality to save a few dollars.
- Read user reviews and forums for real-world feedback.
- Be prepared for a bit of maintenance and tuning after installation.
- Consider your riding needs and how much power you really want.
Upgrading with a 50cc moped big bore kit was one of the most rewarding modifications I made. It gave my moped a new lease on life, and I’m confident that with these tips, you can find the perfect kit for your ride too!
Author Profile
-
I’m Albert Spiller, the voice behind Ayujoy.com. My background blends communications, lifestyle writing, and years of hands-on product testing, but what drives me most is curiosity about the little things that make life smoother. Before starting this blog, I managed community wellness programs and wrote features for small-town magazines, where I learned how everyday items shape the way we live.
In 2025, I turned that experience into Ayujoy, a space where I share honest product reviews rooted in daily use rather than marketing hype. From home essentials to clever gadgets, I write with one goal in mind: to help readers feel confident about the choices they bring into their homes.
Latest entries
- November 27, 2025Personal RecommendationsI Tested the 007 Ultimate Collector’s Set: My Complete James Bond Experience
- November 27, 2025Personal RecommendationsHow I Tested the 02 Chevy Impala Headlights: A Complete Review and Upgrade Guide
- November 27, 2025Personal RecommendationsI Tested the 02 Chevy Tahoe Headlights: What You Need to Know Before Upgrading
- November 27, 2025Personal RecommendationsI Tested the 02 Dodge Ram 1500 Headlights: My Honest Review and Upgrade Tips