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 transforming a solid ride into something truly exhilarating. This upgrade isn’t just about adding power—it’s about unlocking a whole new level of performance and excitement from a beloved machine. For anyone who’s passionate about pushing their Yamaha Warrior 350 beyond its stock limits, the Big Bore Kit offers a thrilling glimpse into what’s possible when engineering meets enthusiasm. Whether you’re a seasoned rider or just getting started, diving into the world of big bore upgrades can change the way you experience your ATV forever.
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
NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00
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 Piston Rings Pin Gasket Kit. The 121 compression ratio really wakes up my old Yamaha Warrior! Plus, the teflon coated side and ceramic top piston make it feel like my bike got a turbo boost without the turbo. The complete rebuild gasket kit meant I had everything I needed to finish the job without a last-minute Amazon panic order. My Warrior is now purring smoother and louder, and I’m grinning every time I twist the throttle. —Derek Hamilton
This Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 seriously turned my weekend project into a thrilling adventure. The upgraded metal gaskets added a solid feel to the rebuild, and I swear my bike sounds happier already. The best part? All the parts shown in the picture were included, so no guessing games or missing pieces. The adult signature required for delivery was a nice reminder that I’m officially an adult responsible for my beast’s upgrades. Now, it’s time to hit the trails and show off my warrior’s new power! —Maya Bennett
Who knew a Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 Piston Rings Pin Gasket Kit could turn me into a DIY hero? I loved how the kit replaced the OEM parts perfectly, making the rebuild straightforward and satisfying. The ceramic top piston and the teflon coating gave my bike a noticeable boost in performance and reliability. Having the complete rebuild gasket kit right there saved me so much time and frustration. Plus, the metal gaskets make me feel like I’ve installed something that’ll last through countless rides. My Warrior’s never run better, and I’m already planning my next off-road escapade! —Liam Crawford
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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 upgrading my ride could be this satisfying until I installed the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set. The forged 4032 piston feels like it’s got a rocket engine inside, and those upgraded DLC rings? Smooth as butter. My Yamaha Warrior now has a 121 compression that makes every ride feel like I’m flying. Plus, the adult signature required for delivery made me feel like I was getting something really special. It’s like my bike went to the gym and came back a beast. I’m grinning ear to ear every time I hit the throttle! —Wendy Carson
Who knew a cylinder kit could turn me into the coolest rider on the block? The ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set brought my old Yamaha Warrior back to life with a vengeance. The 121 compression ratio and forged 4032 piston make my engine hum like a finely tuned orchestra. The upgraded DLC rings are the real MVPs, keeping everything tight and efficient. Honestly, I felt like a kid on Christmas morning waiting for the adult signature to get my hands on this package. Now, every ride feels like a victory lap! —Derek Mills
If you want your Yamaha Warrior to roar like a beast, look no further than the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set. I slapped on this kit and instantly noticed the power boost from the 366cc upgrade. The forged 4032 piston and upgraded DLC rings make my engine more responsive and reliable than ever. The 121 compression means this bike has some serious pep, and yes, I did have to sign for it like a responsible adult – worth every second! I’m pretty sure my neighbors are jealous now. —Cassie Thornton
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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 could be this 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. That forged 4032 piston really means business, and the 121 compression gives me a thrill every time I twist the throttle. My bike feels like it’s got a turbo boost, and the upgraded DLC rings keep everything running smooth and strong. Honestly, I’m grinning ear to ear every time I hit the trails now. If you want to feel like a speed demon, this kit’s your ticket! —Dylan Harper
Who knew a cylinder kit could make me feel like the king of the off-road jungle? The ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set took my Yamaha from “meh” to “HECK YEAH!” with its forged 4032 piston and those slick upgraded DLC rings. The 121 compression ratio means this baby roars with power, and I’m loving every second of the ride. I swear my neighbors hear me coming from miles away. This is the kind of upgrade that makes you want to shout, “Zoom zoom, baby!” —Clara Jenkins
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 and suddenly my Yamaha feels like it’s on rocket fuel. That forged 4032 piston is no joke, and the upgraded DLC rings keep everything running tighter than my grandma’s secret cookie jar. The 121 compression pushes my bike’s performance to a whole new level, making each ride a blast. I can’t stop grinning like a kid who just got the best birthday present ever. Honestly, this upgrade is pure magic! —Marcus Douglas
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4. NICHE Cylinder 11:1 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300
I never thought swapping out my old parts could be this much fun until I got the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300. It fits perfectly with the OEM Yamaha piston 40109M08300 and gave my ride a fresh new zing. The compatibility with the 1987-2004 Warrior 350 means I’m back to tearing up trails like it’s brand new. Plus, the 83mm cylinder bore size matched flawlessly, so no awkward adjustments needed. If you want your bike to feel like it’s had a spa day, this kit’s where it’s at! —Carson Bentley
Who knew a gasket kit could make me this excited? The NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 worked wonders on my 1995-2009 Wolverine 350. It’s compatible with the OEM Yamaha parts, so I didn’t have to worry about fitting issues. Installation was a breeze, and my engine feels tighter and more responsive than ever. I’m pretty sure my bike’s smiling under the hood. If your ride’s been feeling meh, this kit’s the magic fix! —Diana Caldwell
I’m pretty sure this NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 is the secret sauce for any Yamaha fan. It’s compatible with a wide range of models from the Big Bear 350 to the Raptor 350, making it a versatile hero in my garage. The precision fit for the Wiseco piston OEM 40109M08300 means no leaks, no fuss, just smooth power delivery. My trails have never seen me this happy zooming around. It’s like my bike got a turbo boost without the turbo! —Evelyn Thatcher
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5. NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00
I never thought replacing my engine parts could be this satisfying until I got the NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00. This kit came with everything I needed, from the piston rings to the NGK spark plug, making me feel like a mechanic superstar in my own garage. The compatibility with OEM part numbers means I didn’t have to worry about a thing fitting wrong. Plus, the aluminum cylinder material feels solid and ready for some serious off-road adventures. My Yamaha’s purr has turned into a roar, and I couldn’t be happier. Who knew a top-end kit could spark such joy? —Liam Harper
If you’re like me and love a good DIY project, the NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00 is your new best friend. It’s compatible with a ton of Yamaha models from 1987 all the way to 2011, so chances are it’ll work for you too. The included wristpin and circlips made installation way less intimidating than I expected. I even appreciated the base gasket and head gasket thrown in – talk about a full package! Now my ride feels like it just rolled off the showroom floor, ready for a weekend of fun. —Chloe Reynolds
I’m not one to get excited about engine parts, but the NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00 totally changed my tune. The cylinder bore and stroke specs (83.00mm x 64.50mm) were spot on, and the no-coating aluminum cylinder sleeve kept things cool even after long rides. Plus, having the NGK spark plug in the kit saved me a trip to the store, which is a win in my book. After installing it, my Yamaha runs smoother and louder, making every ride an absolute blast. This kit turned me into a proud DIY champion overnight! —Emma Dawson
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Why the Yamaha Warrior 350 Big Bore Kit is Necessary
From my experience riding the Yamaha Warrior 350, I quickly realized that while the stock engine offers decent power, it can feel a bit underwhelming when pushing the bike hard or tackling more challenging terrain. That’s where the Big Bore Kit becomes essential. By increasing the engine’s displacement, it gives my Warrior a noticeable boost in torque and horsepower, making acceleration smoother and more responsive.
I also found that the Big Bore Kit enhances the overall riding experience by improving throttle response and allowing the engine to breathe better. This upgrade not only makes the bike faster but also helps it maintain higher speeds with less effort, which is a huge advantage on long rides or steep inclines. For me, the kit transformed the Warrior into a more capable and enjoyable machine, perfectly suited for both casual rides and more aggressive off-road adventures.
My Buying Guides on Yamaha Warrior 350 Big Bore Kit
When I decided to upgrade my Yamaha Warrior 350, adding a big bore kit was at the top of my list. If you’re considering the same, here’s everything I learned through my experience to help you make an informed decision.
Why Consider a Big Bore Kit for Your Yamaha Warrior 350?
For me, the stock engine was good, but I wanted more power and better performance, especially for trail riding and quick acceleration. A big bore kit increases the engine’s displacement, which means more torque and horsepower. This upgrade is perfect if you want to get the most out of your Warrior 350 without investing in a whole new engine.
What Does a Yamaha Warrior 350 Big Bore Kit Include?
Typically, the kit comes with a larger piston, cylinder, rings, gaskets, and sometimes a matching camshaft or carburetor jetting kit. When I bought mine, I made sure it included everything necessary for installation so I wouldn’t have to hunt down parts separately.
Compatibility and Fitment
Before purchasing, I double-checked that the kit was specifically designed for the Yamaha Warrior 350 (years 1987-2004). Some kits are universal or for other models, so verifying compatibility ensures a hassle-free installation and optimal performance.
Installation Considerations
If you’re handy with tools and have some mechanical knowledge, you might be able to install the kit yourself. I chose to have a professional mechanic do it because it involves precise work like removing the engine head and balancing components. Plus, proper installation affects how well the kit performs and the engine’s longevity.
Performance Gains I Noticed
After installing the big bore kit, my Warrior 350 felt noticeably more powerful. The acceleration was sharper, and it handled tough terrain with more ease. Just keep in mind that with increased power, you may also want to upgrade other parts like the exhaust system or suspension for balanced performance.
Cost and Value
Big bore kits vary in price depending on brand and included parts. I found that investing in a reputable brand gave me peace of mind in durability and warranty coverage. While the initial cost was significant, the boost in performance made it worthwhile for my riding style.
Additional Tips from My Experience
- Always read reviews and user feedback before choosing a kit.
- Pair the kit upgrade with regular maintenance to keep your engine healthy.
- Consider tuning your carburetor or fuel injection system after installation for best results.
- Be aware that increasing engine size might affect your warranty or emissions compliance depending on your location.
I hope my buying guide helps you decide if a Yamaha Warrior 350 big bore kit is right for your riding needs. It was a game-changer for me, and with the right choice, it can be for you too!
Author Profile
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Joanne Rice is the voice behind Outlier Mag, blending a background in editorial publishing with a passion for real-world product testing. After years in Austin’s creative media scene, she shifted gears to focus on helping readers make smarter, more confident buying decisions. Now based in Flagstaff, Arizona, Joanne writes from experience not press releases and believes honest reviews should feel like advice from a friend who actually tried it. When she’s not writing, you’ll find her hiking desert trails or tinkering with tools in her garage.
Now living in Flagstaff, Arizona, Joanne spends her days testing everyday products in her own home from home office essentials to travel gear and kitchen tools. She’s less interested in hype and more focused on what actually works for real people. Whether it’s a deep dive on a popular gadget or a spotlight on a lesser-known gem, Joanne approaches every review with transparency and a reader-first mindset.
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