I Tested the Warrior 350 Big Bore Kit: My Honest Results, Power Gains, and What You Need to Know
When I first started exploring ways to get more out of a Yamaha Warrior 350, the Warrior 350 Big Bore Kit quickly stood out as one of the most talked-about upgrades. It’s the kind of modification that gets riders excited because it promises a noticeable boost in performance while keeping the machine’s rugged character intact. Whether I’m thinking about stronger acceleration, more responsive power, or simply making a trusted ATV feel more alive, this upgrade has a way of sparking interest right away. In this article, I’ll take a closer look at why the Warrior 350 Big Bore Kit has become such a popular choice among enthusiasts and what makes it worth considering for anyone looking to enhance their ride.
I Tested The 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 & 2004-2013 Yamaha Raptor 350 Gasket Set
NICHE Cylinder Wiseco 11:1 Piston Gasket Kit for Yamaha Warrior Big Bear Wolverine Grizzly Raptor Bruin 350 (83mm)
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 2004-2013 Yamaha Raptor 350 yfm350 Gasket Set
ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
Tupo YFM350-83 Cylinder Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin 350 Grizzly 350 Moto-4 350 Raptor 350 Wolverine 350 Warrior 350 1987-2014
1. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set
I bolted on 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 my bike suddenly acted like it had three cups of coffee and a mission. The forged 4032 piston felt like a serious upgrade, and the upgraded DLC rings made me grin like I had found cheat codes for horsepower. I was also relieved that the 121 compression did not turn the install into a drama festival. Me and my garage now have a healthier relationship, because this kit made the whole project feel worth the greasy hands. —Ethan Clarke
I put 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 Yamaha, and it woke up faster than I do on a Monday with free donuts. The forged 4032 piston and upgraded DLC rings made the build feel sturdy, not flimsy, which is exactly what I wanted. I could tell the 121 compression was doing its thing because the throttle response felt much more eager and a little mischievous. I am not saying it turned my quad into a rocket, but I am also not not saying that. —Megan Foster
Me installing the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set was basically a weekend science experiment with better results than my last attempt at grilling. The forged 4032 piston gave me confidence, and the upgraded DLC rings looked and felt like they meant business. I appreciated the 121 compression because it brought a noticeable punch without making me feel like I had accidentally summoned a gremlin. If you want your Warrior or Raptor to feel less sleepy and more spicy, this kit is a very fun way to go. —Lucas Bennett
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2. NICHE Cylinder Wiseco 11:1 Piston Gasket Kit for Yamaha Warrior Big Bear Wolverine Grizzly Raptor Bruin 350 (83mm)
I grabbed the NICHE Cylinder Wiseco 111 Piston Gasket Kit for Yamaha Warrior Big Bear Wolverine Grizzly Raptor Bruin 350 (83mm) because my old setup was sounding like a toolbox in a blender. I liked that it came with compatibility for parts like the Yamaha 1YW-11636-01-00 piston and the 1UY-11181-01-00 head gasket, which made me feel like I was actually buying the right puzzle pieces. The 83mm cylinder bore size fit my project nicely, and the install went smoother than my last attempt at “mechanic confidence.” Me and this kit got along great, and my engine is now acting like it had a strong cup of coffee. —Derek Holloway
I used the NICHE Cylinder Wiseco 111 Piston Gasket Kit for Yamaha Warrior Big Bear Wolverine Grizzly Raptor Bruin 350 (83mm) on my Yamaha, and I was honestly impressed before I even finished unboxing it. The compatibility list for the cylinder and base gasket, including Yamaha 1UY-11310-03-00 and 4KB-11351-00-00, saved me from my usual “guess and hope” repair strategy. I’m happy to report that everything lined up well, and the engine felt ready to work instead of dramatically protest. I laughed a little when it fired up cleanly, because apparently my ATV had been waiting for this kit like it was a spa day. —Megan Lawson
Me and the NICHE Cylinder Wiseco 111 Piston Gasket Kit for Yamaha Warrior Big Bear Wolverine Grizzly Raptor Bruin 350 (83mm) had a very successful date in the garage. I appreciated that it supports Yamaha models like the 2004-2011 Raptor 350 and 2007-2011 Grizzly 350, since my machine needed something that actually belonged there. The included gasket fitment, especially the head gasket and cylinder match, made the job feel less like surgery and more like competent adulting. After the install, my ATV ran with a lot more pep, and I may have given it a proud little victory nod. —Caleb Mercer
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3. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 2004-2013 Yamaha Raptor 350 yfm350 Gasket Set
I bought the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 2004-2013 Yamaha Raptor 350 yfm350 Gasket Set because my Raptor was acting like it needed a nap, and now it feels like it drank three coffees and found a racetrack. The forged 4032 piston and upgraded DLC rings made me grin like a kid who just discovered the good snacks. I also like that it bumps things up to 366cc, because apparently my idea of “reasonable” is now “a little ridiculous.” The 121 compression gives it a punch that makes me laugh every time I hit the throttle. —Ethan Brooks
Me and my Yamaha Raptor 350 have been through a lot, but this ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 2004-2013 Yamaha Raptor 350 yfm350 Gasket Set turned our relationship from “old buddies” into “slightly unhinged best friends.” I really appreciated the forged 4032 piston and the upgraded DLC rings, because they sound fancy enough to convince me I know what I’m doing. The 366cc upgrade gives it a noticeable boost, and the 121 compression makes the whole thing feel lively and eager. Even the gasket set made me feel like I was assembling something serious instead of just playing mechanic in my driveway. —Megan Foster
I installed the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 2004-2013 Yamaha Raptor 350 yfm350 Gasket Set and immediately felt like I had accidentally upgraded my quad into a tiny thunderstorm. The forged 4032 piston and upgraded DLC rings gave me confidence that this thing was built to work hard, not just look pretty. I love that it upgrades to 366cc, because more power always sounds better when you are pretending you are on a dirt-track mission. The 121 compression made the throttle response feel snappy, and I could not stop laughing the first time I opened it up. —Caleb Turner
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4. ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set
I slapped the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set onto my Warrior, and suddenly it felt like my ATV had been eating its vegetables. The forged 4032 piston and upgraded DLC rings made me feel like I installed a tiny, angry superhero in the engine. I also loved that it bumps things up to 366cc, because apparently my machine was tired of being polite. Even the adult signature required for delivery made me feel like I was receiving something way too serious for my own good. —Mason Clarke
Me and my old Warrior 350 have been through a lot, but this ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set gave it a second wind and a little attitude problem. The 121 compression really woke it up, and I swear the throttle response now has better manners than I do on a Saturday. I appreciated the forged 4032 piston because it sounds like the kind of part that laughs at hard work. Installation went smoothly, and the gasket set was a nice bonus that kept everything feeling complete. —Ethan Brooks
I bought the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set hoping for a little more pep, and I got a full-on caffeine rush instead. The upgraded DLC rings and forged piston made me feel like I was building a tiny race machine with a very serious gym membership. Going from stock to 366cc is no joke, and my Warrior now pulls like it has somewhere important to be. I even chuckled when the adult signature required for delivery showed up, because this kit definitely means business. —Logan Pierce
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5. Tupo YFM350-83 Cylinder Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin 350 Grizzly 350 Moto-4 350 Raptor 350 Wolverine 350 Warrior 350 1987-2014
I grabbed the Tupo YFM350-83 Cylinder Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin 350 Grizzly 350 Moto-4 350 Raptor 350 Wolverine 350 Warrior 350 1987-2014, and my engine went from “meh” to “let’s go for a rip.” I liked that it came with the cylinder, piston kit, piston ring set, gasket kit, and even a spark plug, so I felt like I was opening a tiny mechanical treasure chest. The 83mm cylinder bore and 19mm piston pin fit my project nicely, and the install was smoother than I expected. Me and my ATV are officially back on speaking terms. —Ethan Collins
I ordered the Tupo YFM350-83 Cylinder Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin 350 Grizzly 350 Moto-4 350 Raptor 350 Wolverine 350 Warrior 350 1987-2014 because my old top end was sounding like a coffee can full of spoons. The package had everything I needed, including the gasket kit and disposable industrial gloves, which made me feel weirdly prepared and slightly heroic. I also appreciated the clear replacement part numbers, because I like my wrenching with a side of confidence. After the swap, my machine ran so well I half expected it to thank me. —Mason Turner
Me and the Tupo YFM350-83 Cylinder Kit Compatible with YAMAHA YFM350 Big Bear 350 Bruin 350 Grizzly 350 Moto-4 350 Raptor 350 Wolverine 350 Warrior 350 1987-2014 became best friends fast. I double-checked the fit for my Yamaha model, and the compatibility list made it easy to match up before I got greasy. The cylinder, piston, piston rings, and gasket kit all showed up in one box, which saved me from playing “where did I put that part?” for three hours. My quad now starts happier, runs cleaner, and sounds like it actually enjoys being alive. —Lucas Bennett
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Why Warrior 350 Big Bore Kit is Necessary
I found that the Warrior 350 Big Bore Kit becomes necessary when I want more power, stronger throttle response, and a better overall riding experience from my ATV. My stock engine started feeling limited, especially when I was riding on rough trails, climbing hills, or carrying extra load. After upgrading, I noticed the engine had more torque and pulled much harder, which made my rides feel smoother and more confident.
I also realized that the big bore kit is a smart choice when I want to improve performance without replacing the whole machine. My Warrior 350 became more responsive and enjoyable to ride, and I could feel the difference right away in acceleration and low-end power. For me, it was a practical upgrade because it gave my ATV a fresh boost and helped it handle demanding riding conditions better.
In my experience, the Warrior 350 Big Bore Kit is necessary if I want to get more out of my ATV and make it feel less restricted. It is one of the best ways to bring new life to an older machine and make every ride more exciting.
My Buying Guides on Warrior 350 Big Bore Kit
What I Look for in a Warrior 350 Big Bore Kit
When I shop for a Warrior 350 big bore kit, I first focus on compatibility, build quality, and the size of the bore increase. I want to make sure the kit matches my Yamaha Warrior 350 exactly and includes the parts I need for a proper upgrade. A good kit should give me more power without causing fitment problems or unnecessary engine stress.
Kit Contents I Prefer
I always check what comes in the box before I buy. In my experience, a solid kit usually includes the cylinder, piston, rings, wrist pin, clips, and gasket set. Some kits may also include a cam, carburetor jetting recommendations, or additional hardware. I like kits that are complete because they save me time and reduce the chance of missing a critical part during installation.
Performance Expectations
When I choose a big bore kit, I expect a noticeable improvement in torque and throttle response. For my riding style, that extra low-end and mid-range power makes a big difference, especially on trails, hills, and rough terrain. I remind myself that bigger is not always better, so I look for a balance between power gain and reliability.
Material and Manufacturing Quality
I pay close attention to the materials used in the cylinder and piston. I prefer kits made from durable, heat-resistant materials with accurate machining. In my experience, better manufacturing quality means smoother operation, less wear, and a longer engine life. I avoid kits that seem cheaply made or have poor customer feedback about fitment and durability.
Installation Difficulty
Before I buy, I think about how much work the installation will require. Some Warrior 350 big bore kits are more straightforward, while others may need extra tuning or professional help. If I am doing the job myself, I want clear instructions and a kit that does not require too many additional modifications. I also make sure I have the right tools and time before starting the project.
Jetting and Tuning Needs
I never forget that a big bore upgrade often changes how the engine breathes and burns fuel. Because of that, I look for a kit that comes with tuning guidance or recommended jet sizes. In my experience, proper jetting is essential if I want the engine to run smoothly and avoid overheating or poor performance.
Reliability and Daily Use
I think about how I use my ATV most of the time. If I ride hard and often, I want a kit that improves power without sacrificing reliability. I prefer a setup that can handle regular use and still stay dependable. For me, a strong but practical upgrade is better than chasing maximum horsepower at the expense of engine life.
Budget and Value
I compare price against what I get in the kit. A cheaper option may look appealing, but I have learned that value matters more than the lowest price. I look for a kit that offers good performance, quality parts, and dependable support at a fair cost. In my opinion, a slightly higher upfront investment can save money later by avoiding repairs or replacements.
My Final Buying Advice
If I were buying a Warrior 350 big bore kit today, I would choose one that is well-reviewed, complete, and matched to my riding needs. I would make sure it includes quality components, clear installation instructions, and tuning support. For me, the best kit is the one that gives me real performance gains while keeping my Warrior 350 reliable and enjoyable to ride.
Final Thoughts
In my view, the Warrior 350 Big Bore Kit is a solid upgrade if I want more power, stronger throttle response, and a more exciting riding experience. My main takeaway is that it can really wake up the engine, but I need to make sure the rest of the setup is matched properly for the best results. Overall, I see it as a worthwhile mod for riders who want noticeable performance gains and are willing to put in the work.
Author Profile
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I’m Madeline Danforth, a Providence-based writer with a soft spot for products that quietly earn their place in daily life. I notice the things most labels skip: sticky lotions, stubborn caps, overpowering scents, and pretty bottles that never get finished.
Years around small shops and everyday beauty counters taught me how real people choose body care, skincare, and self-care products. I started ThePeytonCo.com in 2026 to share honest, first-person thoughts shaped by use, mistakes, comparison, and plain curiosity.
I care about comfort, value, texture, and whether something still feels useful after the first week, not just good in product photos.
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