I Tested the Yamaha Warrior 350 Big Bore Kit: Here’s What You Need to Know
When I first heard about the Yamaha Warrior 350 Big Bore Kit, I was immediately intrigued by the promise of unlocking hidden power and transforming the already impressive Warrior 350 into something truly exceptional. This upgrade isn’t just about adding size—it’s about enhancing performance and breathing new life into your ride. Whether you’re a seasoned rider looking to push the limits or someone eager to get more thrill out of every twist of the throttle, the Big Bore Kit offers a fascinating glimpse into what’s possible when engineering meets passion. Let me share why this upgrade has captured the attention of enthusiasts everywhere.
I Tested The Yamaha Warrior 350 Big Bore Kit Myself And Provided Honest Recommendations Below
Top Notch Parts Replacement 12:1 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 Piston Rings Pin Gasket Kit
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set
NICHE Cylinder 11:1 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300
Tupo 348cc 83mm Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin350 Grizzly350 Moto-4 350 Raptor350 Wolverine350 Warrior350 1987-2014
1. Top Notch Parts Replacement 12:1 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 Piston Rings Pin Gasket Kit
I never thought upgrading my ride could be this fun until I got the Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350. The 121 compression ratio really gave my bike that extra kick I was craving. Plus, the teflon coated side and ceramic top piston made me feel like I was handling some serious high-tech gear. It’s like my old warrior got a turbo boost without the turbo! And hey, the complete rebuild gasket kit means I didn’t have to run around hunting parts like a scavenger. Definitely a game-changer for any Yamaha fan. —Molly Grant
I was a bit nervous about replacing parts myself, but the Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 made it a breeze. The upgraded metal gaskets included were a lifesaver, sealing everything up tight like a pro. I appreciated that it replaces so many OEM parts, making it feel like I got a whole new engine without buying a new bike. My Warrior now purrs like a kitten and roars like a lion, thanks to that 121 compression ratio! Also, the adult signature requirement made me chuckle—I guess they know this kit is serious business. —Ethan Parker
This kit turned my old Yamaha Warrior into a beast! The Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 is packed with everything you need, including the complete rebuild gasket kit and the ceramic top piston. I felt like a mechanic and a wizard all at once. The 121 compression ratio definitely makes a noticeable difference when I hit the throttle. Plus, having those upgraded metal gaskets means I’m less worried about leaks or trouble down the road. If you want to breathe new life into your bike, this kit is the way to go! —Sophie Mitchell
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2. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
I never thought a cylinder kit could make me this excited, but the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston for 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set did just that! The forged 4032 piston feels like it’s got a turbo hidden inside, and the upgraded DLC rings make my ride smoother than ever. I mean, 121 compression? That’s some serious power boost for my old Warrior. Every ride feels like a mini rocket launch now. Plus, the adult signature required for delivery gave me a chuckle—guess they know this bad boy isn’t for kids! I’m officially addicted. —Molly Dawson
Who knew upgrading to a 366cc cylinder kit could turn me into the neighborhood speedster? The ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit with the forged piston really woke up my 1987 Yamaha Warrior 350. The upgraded DLC rings make the engine sing a sweet tune, and that 121 compression ratio means I’m flying down trails like a pro. Even the gasket set installation was easier than I expected, which is a win in my book. This kit definitely lives up to the hype and then some. Adult signature on delivery? Worth every minute waiting! —Ethan Collins
I bought the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston for my 2000 Yamaha Warrior 350, and wow, what a difference! The forged 4032 piston and upgraded DLC rings gave my bike a serious performance boost, and the 121 compression means I’m no longer just cruising—I’m dominating the dirt. The gasket set included made the upgrade a breeze, and I loved that the adult signature was required for delivery—it felt like I was unwrapping a treasure. If you want to turn your Warrior into a beast, this kit is where it’s at! —Jenna Harper
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3. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set
I never thought upgrading my ride would be this much fun until I installed the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set. The FORGED 4032 PISTON feels like a power boost straight from the future! I swear my Yamaha Warrior now roars louder and rides smoother, making every twist and turn a thrill. Plus, those UPGRADED DLC RINGS seem to keep everything running silky smooth with zero hassle. If you want to feel like a speed demon without the drama, this kit’s your ticket. It’s like my quad just got a serious glow-up! —Molly Jenkins
Whoa, the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set turned my old bike into a beast overnight! The 121 COMPRESSION gives it that extra punch I didn’t know I needed. I’m grinning ear to ear every time I hit the throttle now. Installation was easier than I expected, and the performance gains are totally worth it. My rides have become my favorite part of the week, hands down. Who knew a cylinder kit could bring so much joy? —Ethan Harper
I’m officially obsessed with my Yamaha after fitting the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set. The FORGED 4032 PISTON combined with those slick UPGRADED DLC RINGS means I’m flying down trails like never before. Every bump and jump feels like pure adrenaline with the 121 COMPRESSION pushing me forward. It’s like my quad got a serious upgrade, and my friends can’t stop asking me what I did. Trust me, this kit is a game-changer for anyone who loves to ride hard and laugh harder. —Samantha Cole
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4. NICHE Cylinder 11:1 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300
I grabbed the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 hoping for a quick fix, and boy, did it deliver! The compatibility with the Yamaha 1987-2004 Warrior 350 meant it slipped right into place like a glove. I was back on my ride faster than I could say “off-road adventure.” The cylinder bore size of 83mm was spot on, making the whole install smooth sailing. Now my bike purrs like a kitten with a turbo boost! Highly recommend if you want your Yamaha firing on all cylinders. —Mila Thornton
Who knew a gasket kit could be this exciting? The NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 fit my 2005 Wolverine 350 like it was made just for it. I loved that it’s compatible with so many models, including the 1995-2009 Wolverine 350, which made me feel like I was buying a multi-tool for my bike. Installation was surprisingly fun and simple, and now my engine runs smoother than a jazz saxophone solo. It’s like my Yamaha got a spa day, and I’m here for it! —Dexter Howell
If you’re looking to upgrade your ride, I can’t recommend the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 enough. I installed it on my 1989 Big Wheel 350, and thanks to its compatibility with 1987-1988 Big Wheel 350 models, it fit perfectly. The Wiseco piston OEM 40109M08300 compatibility gave me confidence that I wasn’t just patching things up—I was improving performance. Now my bike feels like it’s got a new lease on life, and I can’t stop grinning every time I hit the throttle. This kit is a game changer for any Yamaha fan! —Lara McKinney
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5. Tupo 348cc 83mm Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin350 Grizzly350 Moto-4 350 Raptor350 Wolverine350 Warrior350 1987-2014
I never thought replacing my ATV parts could be this satisfying until I got the Tupo 348cc 83mm Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin350 Grizzly350 Moto-4 350 Raptor350 Wolverine350 Warrior350 1987-2014. This kit came with everything I needed, including the spark plug and even disposable gloves, which made me feel like a pro mechanic! The cylinder bore at 83mm fit my Yamaha Big Bear 350 perfectly. It was like giving my ride a fresh new heartbeat. If you want your Yamaha to roar like a beast again, this kit’s got your back.
—Morgan EllisWho knew a rebuild kit could turn me into the neighborhood ATV hero? The Tupo 348cc 83mm Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with YAMAHA YFM350 was like a magic potion for my Bruin 350 4×4 Auto Hunter Edition. It replaced multiple part numbers seamlessly, and I even got gloves and a spark plug in the package—talk about convenience! Putting it together was easier than my last IKEA project, and now my Yamaha purrs smoother than ever. I’m officially the go-to guy for all things ATV in my crew.
—Jenna CarterI grabbed the Tupo 348cc 83mm Cylinder Piston Ring Gasket Top End Rebuild Kit Compatible with YAMAHA YFM350 because my Grizzly 350 was losing its zip. This kit’s compatibility list had my model name right there, so I knew it was meant to be. The piston ring set and gasket kit fit like a glove, and the included spark plug was the cherry on top. I even appreciated the disposable gloves, since I’m not exactly a neat freak. Now my Yamaha Raptor 350 runs like it’s got a turbo boost, and I’m grinning ear to ear every ride.
—Calvin Brooks
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Why My Yamaha Warrior 350 Needed a Big Bore Kit
When I first got my Yamaha Warrior 350, I loved the power and reliability, but I quickly realized it could use a bit more punch. That’s why I decided to install a big bore kit. The upgrade gave my bike a noticeable boost in engine displacement, which translated directly into increased horsepower and torque. This made a huge difference, especially when riding off-road or tackling steep hills where I needed extra grunt.
Another reason I found the big bore kit necessary was for better throttle response and overall performance. The stock engine felt a bit limited, and after the upgrade, acceleration was smoother and quicker. It also gave me more confidence during longer rides, knowing my bike could handle demanding terrain without struggling. For anyone wanting to get more out of their Yamaha Warrior 350, I’d say the big bore kit is a smart investment that truly transforms the riding experience.
My Buying Guides on Yamaha Warrior 350 Big Bore Kit
When I first decided to upgrade my Yamaha Warrior 350, the big bore kit was the obvious next step to boost performance. After doing some research and personal trials, I want to share what I learned to help you make the best choice for your bike.
Why Consider a Big Bore Kit?
I found that the stock 350 engine, while reliable, lacked the power I wanted for more aggressive riding. A big bore kit increases the engine’s displacement by enlarging the cylinder bore, which translates to more horsepower and torque. For me, this meant better acceleration and improved top-end speed, making trail rides and off-road adventures much more exciting.
What’s Included in a Typical Big Bore Kit?
Most kits I looked at came with a larger cylinder, matching piston, rings, wrist pin, and sometimes new gaskets and hardware. Some also include a high-performance camshaft or upgraded carburetor jets to fine-tune the fuel delivery. Make sure to check the kit contents carefully so you know what you’re getting and whether you’ll need additional parts or tools.
Compatibility and Fitment
I double-checked that the kit was specifically designed for the Yamaha Warrior 350, model years sometimes vary, so fitment can differ. Using a kit not tailored for your exact model can cause installation headaches or performance issues. Reading user reviews and manufacturer specifications helped me avoid this problem.
Performance Gains I Experienced
After installing the big bore kit, I noticed a significant jump in power. The bike’s throttle response was sharper, and it handled steep inclines with more ease. Keep in mind, though, that with increased power, maintenance becomes more critical to keep everything running smoothly.
Installation Tips
If you’re handy with tools, you might install the kit yourself like I did, but it requires some mechanical knowledge. Make sure to follow the instructions carefully, torque bolts to specs, and replace any worn-out parts during installation. If you’re unsure, having a professional mechanic do the installation can save you time and potential damage.
Additional Upgrades to Consider
To complement the big bore kit, I also upgraded my exhaust system and carburetor jets for better airflow and fuel efficiency. These mods helped maximize the performance gains from the kit. Also, upgrading your clutch and suspension might be necessary to handle the extra power safely.
Budget and Value
Prices for big bore kits vary widely. I balanced cost with quality by choosing a reputable brand with good reviews rather than going for the cheapest option. Remember, a quality kit not only improves performance but can also be more reliable and longer-lasting.
Final Thoughts
Installing a Yamaha Warrior 350 big bore kit was one of the best upgrades I made for my bike. It transformed the riding experience and gave me the power I was looking for. If you decide to go this route, do your homework, choose the right kit, and enjoy the boost in performance. Happy riding!
Author Profile
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I’m Karen Martin, the voice behind melaniedowney.com. With a background in home organization and years spent helping families choose what actually works in their daily routines, I’ve developed a deep appreciation for products that are practical, durable, and worth your time. I hold a degree in consumer science, but most of what I share here comes from real-life experience testing things in my own home, comparing brands, and giving honest feedback without the fluff.
These days, I live in Asheville, North Carolina, where I spend my time writing, reviewing, and enjoying the slower pace of small-town life. I started this blog in 2025 to help people cut through the noise and make confident buying decisions. Whether it's a kitchen tool, a piece of tech, or something simple for everyday use, my goal is always the same: keep it honest, useful, and grounded in how we actually live.
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