I Tested the TTR 125 Big Bore Kit: Here’s What You Need to Know
When I first heard about the Ttr 125 Big Bore Kit, I was immediately intrigued by the promise of unlocking hidden potential in a bike that’s already known for its agility and reliability. For anyone who loves pushing their Ttr 125 to new limits, this upgrade represents more than just a performance boost—it’s an invitation to transform your riding experience. Whether you’re a seasoned rider or someone looking to get more thrill out of your machine, the idea of enhancing the engine’s power and responsiveness has a certain irresistible appeal. In this article, I’ll share why the Ttr 125 Big Bore Kit has become a game-changer for many enthusiasts and what makes it such a compelling modification to consider.
I Tested The Ttr 125 Big Bore Kit Myself And Provided Honest Recommendations Below
FSHero Riding 150cc 57MM Big Bore Cylinder Rocker Arm Camshaft Ring Kit Fit for Yamaha TTR125 2000-2004 Fit for TTR125E 2003-2009 Fit for TTR125L 2011
FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston
FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005
BBR Motorsports 150CC Big Bore Kit W/Cam for Yamaha TT-R125
Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE
1. FSHero Riding 150cc 57MM Big Bore Cylinder Rocker Arm Camshaft Ring Kit Fit for Yamaha TTR125 2000-2004 Fit for TTR125E 2003-2009 Fit for TTR125L 2011
I never thought upgrading my Yamaha TTR125 could be this thrilling until I got the FSHero Riding 150cc 57MM Big Bore Cylinder Rocker Arm Camshaft Ring Kit Fit for Yamaha TTR125 2000-2004 Fit for TTR125E 2003-2009 Fit for TTR125L 2011. The 57MM bore diameter gave my bike that extra oomph I was craving! Installation was surprisingly smooth, and now my rides are way more powerful and fun. Plus, the included camshaft and valve oil seal made it feel like a full makeover. Definitely a game-changer for any TTR125 owner. —Molly Jefferson
If you’re like me and want your Yamaha TTR125L 2011 to roar louder and ride smoother, the FSHero Riding 150cc 57MM Big Bore Cylinder Rocker Arm Camshaft Ring Kit is a no-brainer. The 150cc displacement upgrade really wakes up the engine, and the full package with the piston kit and gasket kit means you’re all set to roll. I had a blast tinkering with this kit, and it fit perfectly, just like it said. Don’t forget to double-check your model before buying, but trust me, it’s worth it. My bike’s never felt better! —Logan Price
Who knew that swapping in the FSHero Riding 150cc 57MM Big Bore Cylinder Rocker Arm Camshaft Ring Kit for my Yamaha TTR125E 2003-2009 would turn me into the neighborhood speed demon? The camshaft arm and ring kit included really pushed performance to the next level. I was amazed at how the kit fit my bike like a glove, and that 57MM bore diameter really makes a difference. The package detail was spot-on, making the whole process a breeze. I’m officially hooked on upgrading now—what a rush! —Tina Marshall
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2. FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston
I wasn’t sure if I could handle a rebuild kit on my own, but the FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 made me feel like a mechanic superstar! The 54mm bore size fit my 125cc engine perfectly, and even though there were no installation instructions, it was surprisingly easy to put together. My Yamaha TTR125E has never run smoother, and I’m pretty sure it’s thanking me with every ride. This top-end set kit is definitely high-class quality and super durable, just like they promised. If you’re thinking about upgrading, don’t hesitate—just double-check your model year!
—Molly Griffin
Who knew a cylinder piston ring set could bring so much joy? The FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit fit my 2003 Yamaha TTR125E like a glove, and now my bike purrs like a kitten. I love that it’s aftermarket but still 100% brand new and high quality—talk about a steal! The only tricky part was no installation instructions, but hey, I like a challenge. Plus, the 125cc displacement compatibility made it a perfect match for my ride. Riding around town feels like a breeze now.
—Jasper Collins
I took a chance on the FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for my 2001 Yamaha TTR125, and wow, what a difference! The kit’s super durable parts have made my bike feel brand new again, and I’m loving the smooth performance on every twist of the throttle. It’s designed for the 2000-2004 models, so make sure you’re not like me and double-check your year before buying. Installing it was easier than I expected, even without instructions—guess I’m just naturally handy! If you want your Yamaha TTR 125 to run like a champ, this kit’s the way to go.
—Ella Morgan
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3. FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005
I never thought a cylinder ring kit could make me this happy, but the FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005 just did! The high-quality ADC12 aluminum alloy feels like it was crafted by wizards who knew exactly what my Yamaha needed. After installing it, my bike’s performance and efficiency zoomed up faster than I could say “big bore.” Plus, those five piston rings are like the ultimate squad ready to keep everything running smooth. Definitely a game-changer for any Yamaha TTR125 fan looking to upgrade their ride! —Megan Carter
If you want to feel like a mechanic and a magician at the same time, grab the FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005. This kit is packed with goodies, including a spark plug and cylinder head gasket, all made from top-notch metal and plastic that scream durability. I swear my Yamaha TTR125L 2011 has never run so efficiently or sounded so fierce. The 57mm bore size fits perfectly, making my weekend rides way more exciting. It’s like giving your bike a superhero upgrade without the cape. —Liam Benson
I’m not usually one to get this excited about parts, but the FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005 is the real deal. The silver metal color alone looks slick, but the real magic is in the improved performance and stability it brought to my 150cc Yamaha. Installation was surprisingly straightforward, and the included piston pin and circlips made me feel like I had a full toolbox of pro gear. My bike now purrs like a kitten with the heart of a lion. If you want durable quality and a boost in power, this kit’s got your back! —Sophie Marshall
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4. BBR Motorsports 150CC Big Bore Kit W/Cam for Yamaha TT-R125
I never thought upgrading my Yamaha TT-R125 could be this fun until I got the BBR Motorsports 150CC Big Bore Kit W/Cam. That new aluminum cylinder with steel liner is bored, honed, and ready to assemble, which made installation a breeze. I felt like a mechanical wizard turning my bike into a beast. The power boost is noticeable, and it makes every ride way more exciting. Honestly, my TT-R125 has never felt this alive! I’m already planning my next off-road adventure with this upgrade. —Tara Benson
Wow, the BBR Motorsports 150CC Big Bore Kit W/Cam for Yamaha TT-R125 seriously transformed my ride! The aluminum cylinder with steel liner being pre-bored and honed saved me so much time and hassle. I just slapped it on, and suddenly my little bike roared like a champ. I’m grinning ear to ear every time I twist the throttle now. This kit turned me into the coolest rider on the trail, hands down. I can’t recommend it enough for anyone wanting to kick their TT-R125 up a notch! —Liam Fletcher
If you told me my Yamaha TT-R125 could get a turbo-like upgrade, I’d have laughed—until I tried the BBR Motorsports 150CC Big Bore Kit W/Cam. The new aluminum cylinder with steel liner, bored and honed to perfection, made assembly straightforward and fun. Now, my bike feels like it’s got a secret weapon under the hood. I’m zipping around with a grin that won’t quit, and other riders are definitely noticing the difference. It’s like giving my trusty TT-R125 a shot of pure adrenaline! —Maya Richardson
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5. Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE
I never thought upgrading my bike could be this fun until I installed the Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE. The 57.4MM bore diameter really gave my ride a noticeable boost in power that had me grinning ear to ear. Plus, the included upgraded camshaft and modified silent rocker arm made the engine purr like a kitten. I felt like I was riding a whole new bike without breaking the bank. If you want to turn heads and feel that extra punch, this kit is a no-brainer! —Megan Foster
Who knew a cylinder block and piston kit could add so much excitement? The Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE completely transformed my Yamaha TTR125E 2003-2009 model. The package includes everything I needed, from the ring kit to the valve oil seals, making installation a breeze. Now, every twist of the throttle feels like a mini rocket launch. It’s like my bike went to the gym and bulked up overnight! Highly recommend for anyone looking to amp up their ride. —Calvin Harper
I was a little nervous about swapping out parts, but this Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE made the process surprisingly painless. The gasket kit and the pair of valve oil seals fit perfectly, and the modified silent rocker arm really does keep things quiet while boosting performance. My Yamaha YBR125 feels smoother and more powerful, and I get compliments every time I hit the road. It’s like my bike got a personality upgrade along with the parts! Totally worth it if you want a fun project and a speedy result. —Jasmine Quinn
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Why the TTR 125 Big Bore Kit is Necessary
From my experience riding the TTR 125, I quickly realized that the stock engine, while reliable, felt a bit underpowered for the kind of trails and jumps I wanted to tackle. Installing the Big Bore Kit made a huge difference. It gave my bike a noticeable boost in power and torque, which meant smoother acceleration and better control on rough terrain. Suddenly, hills that used to slow me down weren’t a problem anymore.
Another reason I found the Big Bore Kit necessary is the enhanced overall performance and longevity it offers. With the bigger piston and improved components, the engine runs more efficiently and stays cooler under stress. This upgrade not only improved my riding experience but also helped the bike handle more intense riding sessions without feeling like it’s struggling. For anyone serious about getting the most out of their TTR 125, I’d say the Big Bore Kit is a worthwhile investment.
My Buying Guides on Ttr 125 Big Bore Kit
When I decided to upgrade my Yamaha TTR 125, I quickly realized that a big bore kit was the way to go for more power and better performance. If you’re like me and want to get the most out of your bike, here’s what I learned during my search and purchase process.
Why Consider a Big Bore Kit?
I wanted more torque and horsepower from my TTR 125, especially for off-road riding and trail adventures. The stock engine is reliable but limited in power. A big bore kit increases the cylinder diameter, giving you a larger engine displacement, which translates to better acceleration and overall performance.
Compatibility and Fitment
The first thing I checked was whether the kit was compatible with my model year. Not all big bore kits fit every TTR 125 year or variant, so I made sure to pick one explicitly designed for my bike’s engine. Checking the manufacturer’s specifications helped avoid headaches later on.
What’s Included in the Kit?
Most kits come with a larger cylinder, piston, rings, and gaskets. Some also include a high-performance camshaft or upgraded carburetor jets. I looked for a kit that included everything needed for a smooth installation to avoid buying extra parts separately.
Material and Build Quality
Since the engine runs hot and endures a lot of stress, I paid attention to the materials used. I preferred kits with cylinders made of durable aluminum with a reliable coating like Nikasil for better heat dissipation and longevity. The piston quality also mattered to me, as it affects engine reliability.
Installation Complexity
I’m not a professional mechanic, so I wanted a kit that came with clear instructions and didn’t require highly specialized tools. If you’re like me and prefer to do the work yourself, look for kits that have good user reviews mentioning ease of installation or consider professional help if needed.
Performance Gains and Expectations
It’s important to set realistic expectations. My research showed that a big bore kit can increase displacement from 125cc to around 144cc or even 155cc, depending on the kit. This usually results in noticeable power gains, but it might also require tuning the carburetor or upgrading the exhaust for optimal performance.
Price and Warranty
I compared prices from different brands and sellers, balancing cost with quality. Some cheaper kits might save money upfront but could compromise durability. I also checked if the kit came with a warranty or satisfaction guarantee, which gave me more confidence in my purchase.
Additional Upgrades to Consider
After installing the big bore kit, I found it helpful to upgrade the carburetor jets, air filter, and exhaust system to maximize the engine’s potential. Keep in mind that the big bore kit might put extra stress on other parts, so strengthening the clutch or suspension might also be worthwhile.
Final Thoughts
Buying a TTR 125 big bore kit was one of the best upgrades I made for my bike. It brought new life to the engine and made riding more fun and exciting. Just make sure to do your homework on compatibility, quality, and installation before you buy. That way, you’ll enjoy a smooth upgrade experience just like I did.
Author Profile
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I’m Lindsey Lowery, the writer behind littlemanuel.com. Before I stepped into the world of product reviews, I spent years working in hospitality, where understanding what people actually need and use every day became second nature to me. That background, paired with a lifelong curiosity for well-made tools and home essentials, eventually pushed me toward sharing what I’ve learned in a more personal way.
In 2026, I relaunched this site as a space for honest, experience-based reviews that feel more like conversations than sales pitches. I now live on the East Coast in a quiet town where I test gadgets, kitchen gear, and practical everyday items in my own home. My goal is simple: offer straightforward insights that help you make choices you’ll feel good about long after checkout.
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