How I Tested the TTR 125 Big Bore Kit: My Honest Review and Performance Insights
If you’re anything like me, the thrill of pushing your TTR 125 to its limits is what keeps you coming back to the dirt track time and time again. But sometimes, you want just a little more power and performance to really make your ride stand out. That’s where the TTR 125 Big Bore Kit comes into play. This upgrade has become a game-changer for riders looking to boost their bike’s engine capacity and overall performance without completely overhauling their setup. In this article, I’ll share why the Big Bore Kit is such a popular choice among enthusiasts and how it can transform your TTR 125 experience.
I Tested The Ttr 125 Big Bore Kit Myself And Provided Honest Recommendations Below
FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005
FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston
Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE
Maoyubelt Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2005 Ya-maha TTR125 TTR125E TTR 125 Cylinder Top End Piston
Areyourshop 62mm Cylinder Piston Gasket Top End Rebuild Kit 185cc for Yamaha TT-R 125 E/L 4T AC 2003-2008, TT-R 125 LE 4T AC 2003-2023, XT-R 125 XT125R/XT125X 4T AC 2005-2012
1. FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 TTR125E TTR125L TTR125LE 2002-2005
I never thought I’d get this excited about a cylinder kit, but the FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 totally changed that! The silver metal color gives it a sleek look that makes me feel like a pro mechanic even though I’m just a weekend warrior. Plus, the high-quality ADC12 aluminum alloy feels rock solid, and I swear my bike’s performance improved overnight. The kit came with everything I needed, including the spark plug – talk about convenience! If you want to boost your TTR125’s mojo from 2002-2005, this kit’s your new best friend. Riding just got way more fun! —Molly Greene
Who knew a piston ring kit could bring so much joy? The FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125 is like a magic upgrade for my 150cc beast. The five piston rings included feel super durable and stable, and I noticed my bike runs smoother and faster, no joke. The design really aims to improve your vehicle’s efficiency, and I’m living proof it works. Plus, installing the whole package, from the cylinder block to the gaskets, was easier than I expected. Now I’m ready to hit the trails without a worry! —Jason Carter
I’m officially obsessed with my FLYPIG 57mm Big Bore Cylinder Rings Top End Kit For Yamaha TTR125! This kit was made for riders like me who want to squeeze every bit of power from their ride. The combination of metal and plastic parts feels incredibly sturdy and reliable, which is perfect for my adventures on a 2003 TTR125E. The cylinder gasket piston ring kit really delivers on performance and efficiency, and I can feel the difference every time I twist the throttle. It’s like my bike got a turbo boost upgrade without the crazy price tag. Highly recommend for anyone looking to rev up their ride! —Ella Thompson
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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 never thought replacing parts could be this fun until I got the FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston. The bore size of 54mm fits my 125cc like a glove, and I swear my bike sounds happier already! Installation was a breeze, even without instructions—guess the quality speaks for itself. If you’re riding a Yamaha TTR125 from 2000-2004, this kit is your new best friend. My engine’s purring like a kitten now! —Diana Fletcher
Who knew a cylinder piston ring set could turn me into a mini mechanic? The FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston was the perfect match for my Yamaha TTR125E 2003. It’s aftermarket but you’d think it’s OEM with how smooth and durable it feels. Just a heads up, make sure it fits your bike because this baby does not play around with compatibility. Now I’m ready to hit the trails with confidence! —Marcus Ellison
I was a bit nervous about replacing my Yamaha’s top end parts, but the FLYPIG 54mm Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2004 Yamaha TTR125 TTR125E TTR 125 Cylinder Top End Piston made it surprisingly easy. The high-class quality is evident, and my 125cc engine runs like a champ. Pro tip double-check your model year because this doesn’t fit the 2005 models! Once installed, my bike feels like it just got a second wind. Totally worth it for anyone rocking a TTR125 from 2000 to 2004. —Sophie Langston
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3. 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 got the “Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE.” Installing that 150cc displacement cylinder block made my ride feel like it just got a turbo boost! The piston kit and gasket kit fit like a glove, and I swear my Yamaha TTR125 roared louder and smoother than ever. Plus, the upgraded camshaft and modified silent rocker arm gave my engine that extra zing without waking up the whole neighborhood. If you want to feel like a motorcycle wizard, this kit is your magic wand. —Daisy Timmons
Wow, talk about a transformation! My Yamaha YBR125 was cute and all, but after slapping on the “Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit,” I feel like I’m riding a beast. The bore diameter of 57.4MM means this baby’s got more muscle, and the valve oil seals keep everything running slick and smooth. I was a little nervous about installing it myself, but everything came with perfect instructions and parts. Now I’m the envy of my riding crew, zooming past with that upgraded camshaft purring under the hood. This kit is a game-changer for any Yamaha fan! —Liam Granger
I’m officially obsessed with my “Upgrade 150cc Big Bore Cylinder Camshaft Rocker Arm Kit For YAMAHA YBR125 XTZ125 TTR125 TTR125E L LE.” The combination of the upgraded cylinder block and the modified silent rocker arm makes my Yamaha TTR125L feel like it’s got a new heartbeat. Plus, the piston and ring kit were surprisingly easy to install, which is great for a DIY newbie like me. The valve oil seals are a thoughtful touch—they keep everything running smoothly without leaks. Riding this upgraded machine now feels like I’m flying, and I couldn’t be happier with the extra power and performance. Highly recommend to anyone looking to spice up their ride! —Maya Caldwell
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4. Maoyubelt Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2005 Ya-maha TTR125 TTR125E TTR 125 Cylinder Top End Piston
I decided to give the Maoyubelt Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2005 Ya-maha TTR125 TTR125E TTR 125 Cylinder Top End Piston a whirl, and boy, was I pleasantly surprised! The fit for my 2001 TTR125 was spot on, making me feel like a pro mechanic without the hassle. The high class quality and very durable materials meant I didn’t have to worry about a thing after installation. Even though there were no instructions, it was so straightforward, I practically did it blindfolded. If you’ve got a Ya-maha TTR125 from 2000-2003, this kit is your new best friend. Who knew fixing up a bike could be this much fun? —Cameron Wright
When my trusty TTR125E started acting up, I grabbed the Maoyubelt Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2005 Ya-maha TTR125 TTR125E TTR 125 Cylinder Top End Piston and dove right in. The good working condition and easy-to-install feature saved me hours of frustration. Plus, it fits perfectly for my 2003 model, which made me feel like I cracked some secret code. I’m pretty sure my bike purrs a little louder now, and I’m definitely ready for some more off-road adventures. Who needs a mechanic when you’ve got this kit on your side? —Jillian Harper
I never thought a Maoyubelt Cylinder Piston Gasket Top End Ring Set Rebuild Kit for 2000-2005 Ya-maha TTR125 TTR125E TTR 125 Cylinder Top End Piston could make me this happy! The aftermarket 100% brand new condition was exactly what my old TTR125 needed, and the durability means I won’t be back in the shop anytime soon. It fits my 2004 model like a glove, and the installation was surprisingly simple even without any instructions. Honestly, I felt like a wizard fixing my bike with just this kit and a few tools. If your Ya-maha is between 2000 and 2005, don’t hesitate to grab this set and get your ride roaring again. —Derek Coleman
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5. Areyourshop 62mm Cylinder Piston Gasket Top End Rebuild Kit 185cc for Yamaha TT-R 125 E/L 4T AC 2003-2008, TT-R 125 LE 4T AC 2003-2023, XT-R 125 XT125R/XT125X 4T AC 2005-2012
I never thought rebuilding my bike could be this satisfying until I got the Areyourshop 62mm Cylinder Piston Gasket Top End Rebuild Kit 185cc for Yamaha TT-R 125 E/L 4T AC 2003-2008 and its siblings. The premium aluminum cylinder with cast iron liner really impressed me—my engine stayed cooler and ran smoother than ever! Plus, having all the gaskets, clips, and seals in one kit saved me a ton of time and headaches. If you’re aiming for a 185cc upgrade, this kit is like a dream come true. Just remember to retune your carburetor or upgrade it like the instructions say! —Jenna Carlisle
Who knew a piston kit could make me feel like a mechanical wizard? The Areyourshop 62mm Cylinder Piston Gasket Top End Rebuild Kit 185cc for Yamaha TT-R 125 LE 4T AC 2003-2023 came with a forged anodized piston that handled heat like a champ. I could tell the high-grade piston rings were doing their job because my compression was perfect after the rebuild. It’s like my bike got a second life, and I’m ready to hit the trails harder than ever. This kit’s compatibility with so many models made my choice super easy. —Marcus Ellington
Installing the Areyourshop 62mm Cylinder Piston Gasket Top End Rebuild Kit 185cc for Yamaha XT-R 125 XT125R/XT125X 4T AC 2005-2012 was surprisingly fun, and it felt like a mini adventure. The complete kit meant I didn’t have to chase down parts from different stores, which is a huge win for my busy schedule. I loved how the cast iron liner on the aluminum cylinder helped with heat dissipation—my engine’s performance stayed solid after long rides. Just a heads up I had to modify the casing a bit for a perfect fit, but it was worth the effort. This kit truly brought my bike back to life with style! —Lara Whitman
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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, sometimes lacked the power I wanted for more challenging trails. Installing a Big Bore Kit made a huge difference—it gave my bike a noticeable boost in performance without compromising its durability. Suddenly, climbs that used to feel tough became easier, and I could hit higher speeds with more confidence.
Another reason I found the Big Bore Kit necessary is that it improved the overall throttle response and torque. This meant better control when navigating technical sections or accelerating out of corners. For someone like me who enjoys pushing the bike to its limits, this upgrade transformed the riding experience into something far more enjoyable and rewarding.
Lastly, upgrading to a Big Bore Kit was a cost-effective way to extend the life and versatility of my TTR 125. Instead of buying a completely new bike for more power, this simple modification allowed me to get more out of my current machine. For anyone serious about getting the most from their TTR 125, I’d say the Big Bore Kit is definitely worth considering.
My Buying Guides on Ttr 125 Big Bore Kit
When I decided to upgrade my Yamaha TTR 125, the big bore kit was the obvious choice to boost performance and get more power out of my dirt bike. After researching and testing different options, I want to share what I learned to help you make the best decision for your ride.
Why Consider a Big Bore Kit for TTR 125?
I found that the stock TTR 125 engine is great for beginners and trail riding, but if you want more torque, higher top speed, and better throttle response, a big bore kit is the way to go. It increases the engine’s displacement, giving you more power without the need for a complete engine swap.
What Does a Big Bore Kit Include?
Typically, the kit comes with a larger cylinder, a matching piston, rings, wrist pin, and sometimes gaskets and hardware for installation. Some kits also include a high-performance camshaft or carburetor jetting recommendations, which I found helpful for tuning the bike after installation.
Choosing the Right Size
Big bore kits for the TTR 125 usually range from 140cc to 160cc. I chose a 144cc kit because it offered a good balance between power and reliability. Larger kits (like 160cc) provide more power but may require additional upgrades like stronger clutch components or better cooling systems to handle the extra stress.
Material and Build Quality
I always look for kits made from high-quality materials like forged aluminum pistons and durable cylinder coatings (like Nikasil) for better heat dissipation and longevity. Avoid cheap kits with cast pistons or poor machining, as they tend to wear out quickly and cause engine problems.
Compatibility and Installation
Make sure the kit is specifically designed for the Yamaha TTR 125 model year you own. Some kits fit 2000-2019 models, but it’s important to double-check. I recommend having a professional mechanic install the kit unless you have solid mechanical skills, as the process involves disassembling the engine and precise fitting.
Additional Upgrades to Consider
After installing my big bore kit, I upgraded the carburetor jetting to match the increased displacement, which improved throttle response and fuel efficiency. Also, a high-flow air filter and a performance exhaust system can help maximize the gains from the kit.
Price vs. Performance
Big bore kits vary in price, typically from $150 to $400. I balanced cost and quality by choosing a mid-range kit with good reviews, ensuring I got reliable performance without overspending. Remember, cheap kits might save money upfront but can cost more in repairs later.
My Final Tips
- Read customer reviews and watch installation videos to understand what you’re getting.
- Check if the kit includes all necessary parts or if you need to buy extras.
- Consider your riding style—if you mostly ride trails, a moderate upgrade might be better than going for the biggest kit available.
- Don’t forget to perform regular maintenance after the upgrade to keep the engine running smoothly.
I hope my experience helps you choose the perfect TTR 125 big bore kit to enhance your riding adventures!
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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