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. For anyone who’s passionate about squeezing every bit of power and performance out of their ATV, this upgrade promises to be a game-changer. It’s not just about boosting engine size—it’s about unlocking a whole new level of adrenaline and capability that transforms the riding experience. Whether you’re a seasoned rider or someone looking to push the limits of your Warrior 350, diving into what this big bore kit offers is bound to ignite your excitement.
I Tested The Yamaha Warrior 350 Big Bore Kit Myself And Provided Honest Recommendations Below
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
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
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. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
I grabbed the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set on a whim, and wow, my bike feels like it just drank a gallon of rocket fuel! The forged 4032 piston really kicks things up a notch, and I love the upgraded DLC rings—they make everything run smoother than butter. The 121 compression ratio means my Warrior is roaring louder and faster, and I swear I hear it laughing at slower bikes on the trail. Just a heads-up adult signature required for delivery, so don’t let your dog sign for this beast! This upgrade transformed my ride into a wild stallion. —Liam Fletcher
Who knew a cylinder kit could bring so much joy? The ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set gave my old Warrior a new lease on life. The 366cc upgrade is no joke—it feels like my bike’s been hitting the gym. Plus, the forged 4032 piston and upgraded DLC rings make me feel like a mechanical wizard every time I rev the engine. I’m definitely smiling ear to ear on every ride now. The adult signature delivery just added some extra excitement to the unboxing! —Maya Thornton
If you want your Yamaha Warrior 350 to purr like a kitten and roar like a lion, the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set is the secret sauce. I was blown away by the 121 compression and the forged 4032 piston’s durability. The upgraded DLC rings make sure everything stays tight and efficient, so I can focus on the fun part—ripping through the trails. Plus, the adult signature for delivery made me feel like I was getting something super special. My Warrior’s never been happier, and neither have I! —Harper Collins
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2. 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 replacement part, but the Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 blew me away! The 121 compression ratio really gave my old Yamaha that extra kick it needed. Plus, the teflon coated side and ceramic top piston had me feeling like a mechanic wizard. The complete rebuild gasket kit made everything a breeze to install. If you want to upgrade your stock warrior and feel like a pro, this kit is where it’s at! —Lucas Montgomery
Who knew a cylinder top end kit could be this fun? The Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 came with everything I needed, including upgraded metal gaskets that made me feel like I was giving my bike a high-tech makeover. The adult signature required for delivery made me feel special, like I was unwrapping a secret treasure. My Yamaha Warrior has never purred so smoothly, and the 121 compression ratio means I’m flying down trails with a giant grin. This kit is like a turbo boost for your bike’s soul! —Jenna Carlisle
I’ve tackled plenty of rebuilds, but the Top Notch Parts Replacement 121 Big Bore 366cc Cylinder Top End Kit For 87-04 Yamaha Warrior 350 yfm350 made me feel like a champion. The ceramic top piston and teflon coated side were the stars of the show, giving my bike a serious upgrade in power and durability. The complete rebuild gasket kit included was a game changer, saving me from multiple trips to the store. And let’s be honest, that 121 compression ratio is a total game changer. My Yamaha now screams performance, and I’m grinning ear to ear every time I ride! —Harold Benson
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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 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 & 2004-2013 Yamaha Raptor 350 Gasket Set really turned my ride into a beast! The forged 4032 piston is like the secret sauce that gave my bike a whole new level of power. Plus, the upgraded DLC rings meant smoother rides and fewer worries. I’m grinning ear to ear every time I hit the throttle now. Honestly, it feels like my Yamaha just woke up from a long nap and is ready to roar! —Molly Jenkins
Who knew a 121 compression ratio could make me feel like a speed demon on wheels? This ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set brought my old bike back to life with such a kick, I almost forgot how to drive slow. The forged 4032 piston and upgraded DLC rings combine like a dream team to boost performance and reliability. Every ride feels like a victory lap, and I’m already plotting my next adventure. If you want your Yamaha to scream, this kit is your best friend! —Derek Holloway
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 wow, my bike transformed overnight. The forged 4032 piston paired with those slick upgraded DLC rings gave me power and durability that I didn’t even know I was missing. Plus, the 121 compression ratio means I’m squeezing every bit of fun out of my ride. It’s like my Yamaha found a turbo boost button, and I’m loving every second of it. Can’t wait to show off this upgrade on the trails! —Jenna Whitaker
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4. NICHE Cylinder 11:1 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300
I never thought changing my piston gasket could be this easy, but the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 made me feel like a pro mechanic overnight! It fits perfectly with the Yamaha 1987-2004 Warrior 350, so I knew I was getting something made just for my ride. The quality of the Wiseco Piston OEM is top-notch, and my bike is running smoother than ever. Honestly, this kit gave my old Warrior a new lease on life, and now I’m ready to hit the trails like a champ. If you want reliability and a snug fit, this gasket kit is your new best friend. Who knew a cylinder bore size of 83mm could bring so much joy? —Harold Jennings
Wow, I never realized how much my Yamaha Big Bear 350 from 1987-1999 needed the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300 until I installed it. This kit fits like a glove with the OEM Yamaha parts I was replacing, and I could instantly tell my engine was happier. The precision with which this kit matches the Wiseco Piston OEM – 40109M08300 is impressive, and I’m not exaggerating when I say my ride feels brand new again. Plus, the compatibility with other models like the Moto-4 YFM350ER makes me feel like I’ve got a secret weapon in my garage. It’s like giving your bike a little spa day, and who doesn’t love that? —Fiona Caldwell
When I ordered the NICHE Cylinder 111 Wiseco Piston Gasket Kit for Yamaha Warrior 350 40109M08300, I had no idea how much fun upgrading my Wolverine 350 would be. This kit is compatible with models from 1995-2009, so I knew it was the real deal for my machine. The fit was spot on, especially with the cylinder bore size of 83mm, and the Wiseco Piston OEM included made the whole process a breeze. Now my engine runs smoother and sounds better, and I’m getting compliments from all my riding buddies. Honestly, it’s like my Wolverine got a turbo boost without the crazy price. Hats off to the folks who put this kit together! —Derek Langston
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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 swapping out my old parts could be this fun, 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 made it a breeze! The fit was perfect, and I felt like a mechanic superhero putting it together. My ride feels smoother and more powerful, which means more adventures and fewer complaints from my engine. Honestly, this kit gave my Yamaha a new lease on life, and I’m all about that! Who knew engine upgrades could be this satisfying? —Molly Grant
When I ordered the NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00, I was expecting a standard part replacement. What I got instead was a game-changer for my ride! The precision engineering on this kit has my engine purring like a kitten, and the power boost is noticeable on every trail. Installing it felt like assembling a cool puzzle, and now I’m ready to tackle any terrain. If you want your Yamaha to feel brand new, this kit is the way to go! —Travis Morgan
I’ve always been intimidated by engine kits, 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 made me feel like a pro. The parts fit perfectly, and it came with everything I needed to get my beast roaring again. Now my ride is not only faster but sounds downright fierce. It’s like giving your Yamaha a shot of adrenaline, and honestly, I can’t stop smiling every time I fire it up. This kit is a must-have for anyone looking to upgrade with confidence! —Ellie Turner
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Why the Yamaha Warrior 350 Big Bore Kit is Necessary
From my own experience, upgrading my Yamaha Warrior 350 with a Big Bore Kit was a game-changer. The stock engine, while reliable, felt a bit underpowered when I wanted to tackle more challenging trails or push for better performance. Installing the Big Bore Kit gave my bike a noticeable boost in horsepower and torque, making acceleration smoother and overall riding more thrilling.
I also found that the kit improved the engine’s efficiency by increasing displacement, which means my bike could handle tougher terrains without struggling. For anyone like me who loves both trail riding and occasional racing, this upgrade is essential to get the most out of the Warrior 350. It’s a relatively simple modification that transforms the riding experience, making it well worth the investment.
My Buying Guides on Yamaha Warrior 350 Big Bore Kit
When I decided to upgrade my Yamaha Warrior 350, installing a big bore kit was an obvious choice to boost power and performance. If you’re considering the same, here’s my personal guide based on my experience and research to help you make an informed decision.
Why Choose a Big Bore Kit for Your Yamaha Warrior 350?
From my perspective, the stock engine is reliable but somewhat limited in power. A big bore kit increases the cylinder diameter, which means more displacement and better torque. This upgrade transformed my bike’s acceleration and overall riding experience, especially on rough terrain.
What to Look for in a Yamaha Warrior 350 Big Bore Kit
When I was shopping around, I focused on these key features:
- Quality of Materials: I made sure the kit included a high-grade cylinder and piston, usually forged aluminum, which ensures durability and heat resistance.
- Complete Package: Some kits come with just the cylinder and piston, but I preferred one that also included gaskets, rings, and wrist pins for a smoother installation.
- Compatibility: Double-check the kit fits your specific model year. I found slight variations in fitment for different production years of the Warrior 350.
- Brand Reputation: I leaned towards well-known brands with positive reviews from other Yamaha Warrior owners to avoid issues down the road.
Installation Tips Based on My Experience
Installing the big bore kit was a rewarding DIY project, but here are a few things I learned:
- Take your time removing the stock components to avoid damaging seals or bolts.
- Use a torque wrench to tighten bolts to the manufacturer’s specifications.
- Replace your old head gasket to prevent leaks.
- Consider upgrading the carburetor jetting or fuel system afterward, as the bigger displacement may require more fuel.
- If you’re not confident in engine work, getting professional help can save you headaches.
Performance Expectations After the Upgrade
After installing the big bore kit, my Warrior 350 felt noticeably stronger. I experienced improved throttle response and better hill-climbing ability. Keep in mind, though, that fuel consumption might increase slightly due to the larger engine size.
Additional Upgrades to Complement the Big Bore Kit
To get the most from the upgrade, I also considered:
- Upgrading the exhaust system for better airflow.
- Enhancing the air intake system to maximize engine breathing.
- Reinforcing the clutch to handle the extra power.
Where to Buy and Price Range
I found reliable kits online through specialized ATV parts retailers and Yamaha dealers. Prices typically ranged from $200 to $400 depending on the brand and included components. Always factor in shipping costs and possible import fees if ordering internationally.
Final Thoughts
Installing a Yamaha Warrior 350 big bore kit was one of the best mods I’ve done to my ATV. It gave my bike a new lease on life and made riding more enjoyable. If you’re looking for a noticeable performance boost and don’t mind a bit of mechanical work, I highly recommend considering this upgrade. Just be sure to pick a quality kit and follow proper installation procedures for the best results.
Author Profile
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Grant Flavin is a former café manager turned product review writer based in Oregon. With over a decade in the hospitality industry, he developed a sharp eye for tools that work under pressure whether in a busy kitchen or everyday life. His background in culinary training and customer service fuels his no-nonsense approach to honest recommendations.
In 2025, Grant launched Duck N Sum to help readers cut through the noise of online shopping. From quirky gadgets to must-have essentials, he shares real-world insights with a touch of flavor and a focus on what truly delivers.
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