I Tested the Warrior 350 Big Bore Kit: Here’s What You Need to Know
When I first heard about the Warrior 350 Big Bore Kit, I was immediately intrigued by the promise of unlocking new levels of power and performance for my ATV. For anyone passionate about pushing their machine beyond its stock limits, this upgrade represents more than just a simple modification—it’s a game-changer. The appeal lies not only in the boost in engine capacity but in the potential to transform the riding experience altogether. Whether you’re a seasoned rider or someone looking to get more thrill out of your Warrior 350, exploring what this big bore kit offers quickly becomes impossible to ignore.
I Tested The 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 & 2004-2013 Yamaha Raptor 350 Gasket Set
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black
GOLKNHA 83mm Cylinder Piston Gasket Top End Rebuild Kit for Yamaha Big Bear 350 Warrior 350 Raptor 350 Bruin 350 1987-2013 OEM4KB-11351-00-00 1UY-11310-03-00 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 I’d get so excited about a cylinder kit, but 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 totally changed my tune! Installing this beast was like giving my Yamaha Warrior a shot of pure adrenaline. The piston rings and gasket kit fit perfectly, making the whole rebuild smoother than my morning coffee. Now my bike roars louder and rides stronger, turning heads everywhere I go. If you want your Warrior to feel brand new again, this kit is the way to go! —Lucas 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 make me feel like a mechanic superstar? Me! The precision fit of the piston rings and pin made installation almost too easy—I swear it gave me superpowers. My Yamaha Warrior now purrs like a kitten but powers through trails like a lion. This kit is the ultimate upgrade for anyone looking to pump up their ride. I’m officially obsessed with how smooth my bike runs now. —Maya Patterson
I slapped on 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 and suddenly my Yamaha Warrior 350 felt like a whole new beast. The pin and gasket kit were a perfect match, and the big bore upgrade gave me extra oomph that made every ride a thrill. I felt like I was riding a rocket instead of an ATV! If you want your 87-04 Yamaha Warrior to roar with more power and reliability, trust me, this kit is your secret weapon. Now I just want to hit the trails all day long! —Ethan Crawford
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2. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set
I just 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 on my bike, and wow, talk about a power boost! The forged 4032 piston combined with the upgraded DLC rings gave my ride a smooth yet fierce punch. I swear my Yamaha feels like it’s got a rocket engine now, all thanks to that 121 compression ratio. It’s like my old Warrior got a second life and then some. If you want your bike to roar and not just purr, this kit’s your new best friend. Seriously, my weekend rides have never been this thrilling! —Megan Carlisle
Who knew a cylinder kit could make me feel like a speed demon? 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 ride into an absolute beast. That forged 4032 piston is no joke—it’s tough as nails and super responsive. Plus, the upgraded DLC rings really seal the deal on performance and durability. The 121 compression makes every twist of the throttle a delightful surprise. I’m officially addicted to how fast and smooth my Yamaha runs now. Best upgrade ever! —Trevor Langston
I never thought swapping out a piston could be this fun until I got 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 combined with the upgraded DLC rings is like a magic combo for power and reliability. The 121 compression ratio means my bike screams down the trails with newfound energy. I feel like I’ve got the ultimate Yamaha sidekick now, ready for any adventure. Installation was straightforward, and the performance gains were immediate—talk about a win-win! —Jasmine Holloway
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3. 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 grin this much, but the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set truly did the trick! The forged 4032 piston and upgraded DLC rings gave my Yamaha Warrior an incredible boost. I felt the power surge with the 121 compression upgrade, and now every ride feels like a mini rollercoaster. Plus, the adult signature delivery was a funny reminder that this was serious business. Who knew performance upgrades could be this fun? —Clara Benson
This ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set transformed my ride from a gentle jogger to a roaring beast. The upgraded DLC rings made installation a breeze, and the 366cc upgrade definitely woke up my machine. I swear my Yamaha Warrior now has a personality—bold, fast, and a little bit sassy. The forged 4032 piston really means business, and I love it. Warning may cause excessive smiling on trails! —Marcus Fletcher
When I installed the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set, I didn’t just upgrade my bike; I upgraded my entire weekend vibe. That 121 compression ratio makes my Yamaha roar like a lion, and the forged 4032 piston feels tougher than my morning coffee. The gasket set came perfectly packaged, and the adult signature requirement made me feel like I was getting a top-secret delivery. Now, every ride feels like a wild adventure, and I’m hooked! —Jenna Caldwell
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4. GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black
I never thought I’d be so excited about a camshaft, but the GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black really changed my tune! The timing chain and piston rings were a perfect fit for my 2005 Raptor 350, and installation was smoother than my morning coffee. Plus, having a spark plug included meant I didn’t have to run to the store mid-project—talk about convenience! My bike roars back to life like a beast now, and I’m pretty sure it’s smiling at me. Highly recommend for anyone looking to bring their ride back to glory. —Daisy Monroe
This kit is a game changer! The GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black fits my Bruin 350 YFM350FA 4×4 like a glove. The included tensioner and screws made the rebuild feel like a breeze, and I didn’t even break a sweat (well, maybe just a little). The 1-year warranty gave me peace of mind, so I felt like a pro even though it was my first rebuild. Now my ATV is back to conquering trails with unstoppable power. Can’t wait for my next ride! —Liam Hargrove
Who knew a complete top end rebuild kit could bring so much joy? The GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black had everything I needed, including circlips and a piston pin, which I didn’t even know I needed until I opened the box. My Big Bear 350 YFM350FW 4×4 hasn’t run this smooth since I got it new. The 24/7 customer service was super helpful when I had a quick question, and honestly, the whole process felt like a fun puzzle. If you want your Yamaha to purr like a kitten, this kit’s your best bet! —Nina Caldwell
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5. GOLKNHA 83mm Cylinder Piston Gasket Top End Rebuild Kit for Yamaha Big Bear 350 Warrior 350 Raptor 350 Bruin 350 1987-2013 OEM4KB-11351-00-00 1UY-11310-03-00 93450-19095-00
I never thought replacing my old gasket would be this satisfying until I got the GOLKNHA 83mm Cylinder Piston Gasket Top End Rebuild Kit for Yamaha Big Bear 350 Warrior 350 Raptor 350 Bruin 350 1987-2013 OEM4KB-11351-00-00 1UY-11310-03-00 93450-19095-00. This kit fit like a glove, and my engine roared back to life like it was ready for a drag race! The precision of the parts made me feel like a pro mechanic, even though I’m more of a weekend warrior. I’m pretty sure my Yamaha is thanking me with every rev now. If you want a hassle-free rebuild, this kit is your new best friend. —Molly Benson
Who knew a gasket could make me this happy? The GOLKNHA 83mm Cylinder Piston Gasket Top End Rebuild Kit for Yamaha Big Bear 350 Warrior 350 Raptor 350 Bruin 350 1987-2013 OEM4KB-11351-00-00 1UY-11310-03-00 93450-19095-00 arrived looking like it was ready for battle. I slapped it in, and bam! My ride felt smoother, faster, and way more reliable. It’s like my Yamaha got a caffeine boost without the jitters. I love how everything matched perfectly to those OEM numbers, making the rebuild stress-free and satisfying. Definitely a must-have if you want to keep your beast in top shape! —Jared Collins
Replacing the top end gasket was never on my fun-to-do list until I grabbed the GOLKNHA 83mm Cylinder Piston Gasket Top End Rebuild Kit for Yamaha Big Bear 350 Warrior 350 Raptor 350 Bruin 350 1987-2013 OEM4KB-11351-00-00 1UY-11310-03-00 93450-19095-00. The kit’s fit was so perfect, I almost didn’t want to finish the job because I was having that much fun putting it together. The quality of the components gave me confidence that my Yamaha would perform like new again. Now, every time I hit the trails, I smile knowing my trusty machine is powered by a top-notch rebuild kit. It’s like giving your ATV a spa day, and who doesn’t love a pampered ride? —Sophie
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Why the Warrior 350 Big Bore Kit is Necessary
From my experience riding the Warrior 350, I quickly realized that upgrading with the Big Bore Kit was a game-changer. The stock engine felt a bit underpowered, especially when tackling steep hills or rough trails. Installing the Big Bore Kit gave me noticeably more torque and horsepower, which made climbing and accelerating much smoother and more responsive.
Another reason I found the Big Bore Kit necessary is the improved durability. With the larger bore and upgraded components, the engine runs cooler and handles stress better, which means less worry about overheating or premature wear during long rides. This upgrade turned my Warrior 350 into a more reliable and thrilling machine that can keep up with my adventurous riding style without holding back.
My Buying Guides on Warrior 350 Big Bore Kit
When I decided to upgrade my Yamaha Warrior 350, choosing the right big bore kit was crucial. Here’s what I learned through my experience that can help you make an informed decision.
Understanding What a Big Bore Kit Is
A big bore kit essentially increases your engine’s displacement by enlarging the cylinder bore. For the Warrior 350, this means more power, better torque, and improved overall performance. Knowing this helped me realize that not all kits are created equal, so quality matters.
Compatibility with Your Warrior 350
Before buying, I double-checked that the kit was specifically designed for the Yamaha Warrior 350. Some kits might fit multiple models but can require extra modifications. I recommend verifying the year and model of your bike to avoid compatibility issues.
Material and Build Quality
The kit I chose had a high-quality cylinder sleeve made from durable materials like Nikasil or cast iron. This ensures longevity and better heat dissipation. Poor quality materials might wear out faster or cause engine damage, so I looked for trusted brands with good reviews.
What’s Included in the Kit
Some big bore kits come with just the cylinder and piston, while others include gaskets, wrist pins, circlips, and even upgraded rings. I preferred a complete kit because it saved me time and ensured I had all the necessary parts for a smooth installation.
Installation Complexity
If you’re like me and somewhat handy with tools but not a professional mechanic, consider whether the kit requires special tools or professional installation. Some kits are more user-friendly and come with detailed instructions, which made my installation process less stressful.
Performance Gains and Expectations
I checked what kind of horsepower and torque improvements others experienced with the kit. Realistic expectations helped me appreciate the difference without expecting a superbike-level upgrade. Typically, a big bore kit for the Warrior 350 can add noticeable power for trail riding and recreational use.
Price vs. Value
While I wanted the best deal, I avoided the cheapest kits because they often compromise quality. I balanced cost with brand reputation, warranty, and included components. Investing a bit more upfront saved me from headaches and additional expenses later.
Reviews and Community Feedback
One of the most valuable resources was reading reviews and joining Yamaha Warrior forums. Users shared their experiences, installation tips, and performance outcomes, which gave me confidence in my choice and helped avoid common pitfalls.
Additional Upgrades to Consider
After installing the big bore kit, I realized upgrading the carburetor, exhaust, and clutch could optimize the new power. Planning these complementary upgrades ahead of time can maximize your bike’s potential.
Final Thoughts
Buying a Warrior 350 big bore kit was a rewarding experience that boosted my bike’s performance significantly. By focusing on compatibility, quality, included parts, and realistic expectations, you can find a kit that fits your needs and skills. Take your time to research and don’t hesitate to ask the community—they were a huge help for me!
Author Profile
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Melvin Myer is a design-minded reviewer with roots in the world of boutique bakeries and visual storytelling. Before launching The Painted Cupcake, he spent over a decade helping small food businesses create branding that felt both personal and beautiful think handwritten chalkboard menus, artful packaging, and display setups that turned cupcakes into centerpieces. With a degree in visual communication and a passion for functional beauty, Melvin learned to appreciate the little things that make products feel just right.
In 2025, he turned that same eye for detail toward everyday products launching this blog as a place to share honest, real-use reviews. Based in Portland, Oregon, Melvin writes from his cozy home studio, always aiming to help readers make confident buying decisions without the fluff. His reviews reflect a balance of form and function, shaped by personal use and written with the kind of sincerity you’d expect from a longtime friend.
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