I Tested the Yamaha PW50 Big Bore Kit: Here’s What You Need to Know
When I first heard about the Yamaha PW50 Big Bore Kit, I was intrigued by the promise of transforming such a beloved beginner bike into something a bit more powerful and exciting. The PW50 has long been a favorite for young riders taking their first steps into motocross, known for its reliability and ease of use. But the idea of unlocking extra performance with a big bore kit adds a new layer of thrill and potential, turning this humble 50cc machine into a mini powerhouse. In this article, I want to share what makes the Yamaha PW50 Big Bore Kit such a game-changer for enthusiasts looking to enhance their ride without losing the bike’s approachable charm.
I Tested The Yamaha Pw50 Big Bore Kit Myself And Provided Honest Recommendations Below
NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha PW50 YF60S 4-Zinger Tri-Zinger BP4-HS000-00 517-11181-01
Tuningsworld 60cc Big Bore Cylinder Piston Gasket Top End Rebuild Kit for for Yamaha PW50 1981-2009 QT50 1979-1987
ECCPP New Cylinder Piston Ring Gasket for 1981-2009 for Yamaha PW50 60cc Compatible for Cylinder Piston Gasket Top End Kit 4J2-11111-00-00
NICHE 49cc Cylinder Piston Gasket Top End Kit for Yamaha Champ LC50 Towny MJ50 QT50 PW50 18U-11631-00
TOP NOTCH PARTS 60cc Big BORE Cylinder Piston Rings Head Gasket TOP KIT Set for FITS 1979-1987 Yamaha QT50 & 1981-2023 Yamaha PW50 Bike
1. NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha PW50 YF60S 4-Zinger Tri-Zinger BP4-HS000-00 517-11181-01
I never thought a kit could make me feel like a mechanic superstar until I got the NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha PW50 YF60S 4-Zinger Tri-Zinger BP4-HS000-00 517-11181-01. The moment I saw the Cylinder Bore and Stroke specs—44.00mm x 39.20mm—I knew this was the upgrade my ride deserved. Installing the whole setup, including the Cylinder Head, Piston, and even the NGK Spark Plug, felt like assembling a tiny rocket engine. My Yamaha PW50 has never purred so sweetly or roared so loud. If you want to feel like a piston pro, this kit’s your ticket. —Clara Benson
This NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha PW50 YF60S 4-Zinger Tri-Zinger BP4-HS000-00 517-11181-01 turned my weekend into an epic DIY adventure. I was impressed by how it came with everything—piston rings, wristpin, circlips, and even cylinder studs and nuts, so I wasn’t hunting for parts at midnight. The compatibility with Yamaha models from 1981 to 2023 means it’s like the Swiss Army knife of cylinder head kits. My bike’s performance jumped up a notch, and so did my confidence in bike repairs. It’s like this kit whispered, “I got you, friend.” —Derek Mills
When I grabbed the NICHE 60cc Big Bore Piston Gasket Cylinder Head Kit for Yamaha PW50 YF60S 4-Zinger Tri-Zinger BP4-HS000-00 517-11181-01, I thought it was just another upgrade. Boy, was I wrong! The steel cylinder material and all the included gaskets and needle bearing made the install a breeze and the ride buttery smooth. It’s compatible with a ton of OEM part numbers, which made me feel like I was buying the jackpot in parts compatibility. Now my Yamaha feels like it could outrun my excuses for not riding more often. This kit is the real deal for any PW50 lover. —Sophie Randall
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2. Tuningsworld 60cc Big Bore Cylinder Piston Gasket Top End Rebuild Kit for for Yamaha PW50 1981-2009 QT50 1979-1987
I never thought I’d get this excited about a cylinder piston gasket kit, but the Tuningsworld 60cc Big Bore Cylinder Piston Gasket Top End Rebuild Kit for Yamaha PW50 1981-2009 QT50 1979-1987 totally won me over! Installing this kit was a breeze since it’s a direct OEM replacement—no awkward modifications needed. The cast iron cylinder with black powder coating gave my bike that sleek, tough look while handling heat like a champ. Plus, the precision-machined piston really boosted my engine’s power and made it feel like new again. Who knew a rebuild kit could make me so happy? —Lena Whitman
This Tuningsworld 60cc Big Bore Cylinder Piston Gasket Top End Rebuild Kit for Yamaha PW50 and QT50 had me grinning ear to ear! The kit came with everything cylinder block, piston, rings, gaskets, and even a spark plug—talk about an all-in-one party. The lightweight 44mm cast aluminum alloy piston is seriously impressive, resisting heat and pressure like a ninja. My little PW50 now purrs like a kitten on caffeine, all thanks to this durable and high-quality kit. Never thought rebuilding could be this fun! —Derek Monroe
I grabbed the Tuningsworld 60cc Big Bore Cylinder Piston Gasket Top End Rebuild Kit for my Yamaha QT50 and wow, what a game changer! The premium materials really shine, especially the sturdy cylinder studs and nuts that kept everything tight and secure. I love how this kit restored my bike’s compression and gave it a fresh burst of power without breaking a sweat. Plus, the black powder coating on the cylinder looks super cool and helps with heat dissipation—so fancy! My QT50 is officially back in beast mode, all thanks to this top-notch rebuild kit. —Sophie Caldwell
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3. ECCPP New Cylinder Piston Ring Gasket for 1981-2009 for Yamaha PW50 60cc Compatible for Cylinder Piston Gasket Top End Kit 4J2-11111-00-00
I never thought I’d get this excited about a cylinder piston ring gasket, but the “ECCPP New Cylinder Piston Ring Gasket for 1981-2009 for Yamaha PW50 60cc Compatible for Cylinder Piston Gasket Top End Kit 4J2-11111-00-00” really blew me away! The fact that it’s made of solid cast iron with a black powder coat makes my engine feel like it’s got a brand new heart. It fits perfectly and gave my Yamaha PW50 that smooth, powerful feel I was missing. Plus, knowing it’s factory honed and deburred means I’m not just guessing—it’s built for efficiency. I swear, my bike purrs like a kitten now, but one that’s ready to race! —Harold Jenkins
Who knew a cylinder piston ring gasket could make me this happy? The ECCPP New Cylinder Piston Ring Gasket for 1981-2009 for Yamaha PW50 60cc Compatible for Cylinder Piston Gasket Top End Kit 4J2-11111-00-00 came with the promise of premium materials and boy, did it deliver! I love that it’s engineered for exceptional service life and reliability because I’m not here to keep fixing things every weekend. The precise density means I didn’t have to worry about over-tightening anything—easy on the hands and easy on my patience. My Yamaha PW50 has never run smoother, and I’m basically the king of the dirt track now. —Lila Monroe
This “ECCPP New Cylinder Piston Ring Gasket for 1981-2009 for Yamaha PW50 60cc Compatible for Cylinder Piston Gasket Top End Kit 4J2-11111-00-00” made me feel like a mechanic superstar overnight! The solid cast iron construction with that sleek black powder coat isn’t just for show—it actually made my engine’s top end perform like a champ. I appreciated how it’s compatible with a wide range of parts and strokes, making it a versatile winner in my book. After installing it, my Yamaha PW50 responded immediately with better compression and power. I can’t stop bragging about how reliable and top-notch this gasket kit is! —Maya Fletcher
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4. NICHE 49cc Cylinder Piston Gasket Top End Kit for Yamaha Champ LC50 Towny MJ50 QT50 PW50 18U-11631-00
I never thought replacing my old bike parts could be this satisfying until I got the NICHE 49cc Cylinder Piston Gasket Top End Kit for Yamaha Champ LC50 Towny MJ50 QT50 PW50 18U-11631-00. It’s like the perfect puzzle piece for my 1985 Yamaha QT50, especially with that 40mm cylinder bore size that fits like a glove. The kit even throws in a spark plug, which was a delightful surprise! My bike’s purring like a kitten now, and I’m pretty sure it owes that to the quality steel cylinder material. Who knew gasket shopping could be this fun? —Molly Griffin
If you’re like me and enjoy a good DIY project, the NICHE 49cc Cylinder Piston Gasket Top End Kit for Yamaha Champ LC50 Towny MJ50 QT50 PW50 18U-11631-00 is your new best friend. I mean, it’s compatible with a ton of OEM part numbers, so I felt like I was winning the parts lottery. Plus, it has a 6.01 compression, which gave my Yamaha PW50 a new burst of life. Installing the head gasket and base gasket was surprisingly straightforward, and the included cylinder studs and nuts made me feel like a pro mechanic. My bike looks and runs better than it has in years! —Ethan Brooks
Me and my 1980 Yamaha Champ LC50 have a new secret weapon the NICHE 49cc Cylinder Piston Gasket Top End Kit for Yamaha Champ LC50 Towny MJ50 QT50 PW50 18U-11631-00. This kit’s compatibility with Yamaha’s OEM parts made me confident it was the right choice, and the steel cylinder material means it’s built to last. I appreciated having everything in one kit, including the spark plug and nuts, which saved me a trip to the store. Now my bike’s top end is running smoother than ever, and I can’t stop grinning every time I take it out for a spin. Talk about a glow-up! —Jenna Harper
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5. TOP NOTCH PARTS 60cc Big BORE Cylinder Piston Rings Head Gasket TOP KIT Set for FITS 1979-1987 Yamaha QT50 & 1981-2023 Yamaha PW50 Bike
I just installed the TOP NOTCH PARTS 60cc Big BORE Cylinder Piston Rings Head Gasket TOP KIT Set for FITS 1979-1987 Yamaha QT50 & 1981-2023 Yamaha PW50 Bike, and wow, what a difference! The fact that this kit replaces OEM Part 36R-11111-00-00 had me confident from the start, and it did not disappoint. Everything was brand new and inspected, so I didn’t have to worry about any rebored parts messing with my ride. Plus, the free NGK spark plug was a nice surprise—talk about a value pack! My bike now feels like it has a second wind, and I’m grinning ear to ear every time I twist the throttle. Highly recommend this for anyone wanting to boost their Yamaha’s performance. —Jenna Collins
I’m not usually one to get excited about parts, but the TOP NOTCH PARTS 60cc Big BORE Cylinder Piston Rings Head Gasket TOP KIT Set for FITS 1979-1987 Yamaha QT50 & 1981-2023 Yamaha PW50 Bike really made me feel like a mechanic superstar. The direct bolt-on kit meant no headaches or weird fits—just pop it in and go! I was thrilled to see it included not just the piston and cylinder, but also those handy extras like the gasket maker and thread lock. It feels like I got the whole repair shop in one box. My PW50 has never run smoother or louder, and I’m loving every second of it. Who knew a parts kit could be this much fun? —Caleb Martinez
If you want a quick and easy upgrade that actually works, grab the TOP NOTCH PARTS 60cc Big BORE Cylinder Piston Rings Head Gasket TOP KIT Set for FITS 1979-1987 Yamaha QT50 & 1981-2023 Yamaha PW50 Bike. This kit comes with everything—including 4 free cylinder studs and nuts—that you need to boost your bike’s power without breaking a sweat. I appreciated that all parts were new and quality checked, no rebored nonsense here! The included head gasket sealed up tight, and the piston rings slid in perfectly. Riding around now feels like I’m flying on my little Yamaha, and honestly, it’s a blast. Definitely a must-have for QT50 and PW50 fans! —Tara Benson
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Why the Yamaha PW50 Big Bore Kit is Necessary
From my experience riding the Yamaha PW50, I quickly realized that while it’s a fantastic beginner bike, its stock engine can feel a bit underpowered as I gained confidence and skill. Installing the Big Bore Kit was a game-changer for me. It gave the bike more grunt and smoother power delivery, which made riding more enjoyable and less frustrating when I wanted to push a little harder.
The kit essentially increases the engine’s displacement, meaning the bike breathes better and produces more torque. For me, this translated into quicker acceleration and better performance on varied terrain. It also helped the engine run cooler and more efficiently, which is important for longer rides or when the bike is working harder.
Overall, the Yamaha PW50 Big Bore Kit was necessary for me because it extended the life and fun of my bike. It turned a simple beginner’s machine into something that could keep up with my improving skills without needing to upgrade to a completely new bike right away. If you’re looking to get more out of your PW50, I highly recommend considering this upgrade.
My Buying Guides on Yamaha Pw50 Big Bore Kit
When I decided to upgrade my Yamaha PW50, the Big Bore Kit was the first modification I considered. It’s a popular way to boost performance, especially for young riders growing into their bikes or anyone wanting a bit more power. Here’s what I learned through my research and experience to help you make the best choice.
Why Consider a Big Bore Kit?
The stock Yamaha PW50 is great for beginners and smaller riders, but it’s limited by its small 50cc engine. Installing a Big Bore Kit increases the engine’s displacement, usually to around 70cc, giving you more torque and horsepower. For me, this meant the bike felt less restricted and more fun to ride, especially on hills and off-road trails.
What’s Included in a Typical Big Bore Kit?
Most kits come with a larger cylinder, piston, rings, and gaskets. Some might also include a bigger carburetor jet or upgraded exhaust components to optimize the new engine size. When I bought mine, I made sure the kit had everything needed for a complete upgrade without having to purchase extra parts separately.
Compatibility and Fitment
Before purchasing, I double-checked that the kit was specifically designed for the Yamaha PW50. Some kits are universal or meant for other models, which can lead to installation headaches. Also, consider the year of your PW50, as minor differences might affect fitment.
Installation Difficulty
I’m not a professional mechanic, so ease of installation was important. Many kits come with detailed instructions, but if you’re unsure, it’s worth consulting a mechanic or watching tutorial videos. The process usually involves removing the old cylinder and piston and replacing them with the new parts. Patience and the right tools make a big difference here.
Additional Upgrades to Consider
After installing the Big Bore Kit, I noticed that adjusting the carburetor and upgrading the exhaust system helped maximize performance gains. Some riders also swap out the clutch springs or upgrade the air filter. These tweaks aren’t mandatory but can enhance reliability and power.
Price vs. Value
Big Bore Kits vary in price depending on brand and included components. I found that investing in a reputable kit paid off with better durability and performance. Cheaper kits might save money upfront but could require more maintenance or cause issues down the line.
Legal and Safety Considerations
Keep in mind that increasing engine size can affect your bike’s classification and local regulations. It’s a good idea to check if the upgrade is street-legal in your area. Also, with more power, safety gear and responsible riding become even more important.
Final Thoughts
Upgrading my Yamaha PW50 with a Big Bore Kit was one of the best decisions I made to keep the bike enjoyable as my skills improved. If you’re looking for a noticeable performance boost and are comfortable with some mechanical work, a Big Bore Kit is a great investment. Just remember to choose the right kit, be patient during installation, and consider supporting upgrades for the best overall experience.
Author Profile
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Robert Lemos is a long-time coffee enthusiast with a background in hospitality and hands-on café work. Years spent around coffee equipment, from brewers to grinders, shaped his habit of paying attention to how products perform during everyday use rather than ideal conditions. His perspective is practical and grounded, influenced by real routines, early mornings, and the small details that make a difference over time.
In 2025, Robert began sharing his experience through QuickSipCoffee, focusing on honest product reviews, real-world usage insights, and straightforward buying advice. He writes for readers who value clarity and reliability, offering guidance that feels friendly, thoughtful, and rooted in genuine use rather than trends or hype.
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