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 performance from an already impressive machine. This upgrade has become a game-changer for riders looking to elevate their Yamaha Warrior 350 experience, offering a thrilling blend of increased displacement and enhanced engine capabilities. Whether you’re a seasoned rider seeking more torque and speed or simply passionate about maximizing your ATV’s potential, exploring what a big bore kit can do is an exciting journey that transforms the way you ride.
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 & 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
Engine End Rebuild Kit Crankshaft STD Piston + Ring W/Gaskets Compatible with Yamaha Warrior 350 YFM350X 1987-2004
GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black
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 & 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 brings the power, making my Yamaha roar like a beast. Plus, the upgraded DLC rings have me cruising smoother than ever before. I feel like I’m riding a rocket with that 121 compression pushing me forward. If you want your bike to feel alive, this kit is the way to go! —Maya Thornton
Wow, just wow! The ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 & 2004-2013 Yamaha Raptor 350 Gasket Set transformed my old bike from a gentle giant into a speed demon. I couldn’t believe how the forged 4032 piston and 121 compression worked together to give me serious zip. The upgraded DLC rings also made startup a breeze every time. It’s like my Yamaha found a secret stash of horsepower, and I’m loving every second of it. Total game-changer! —Eli Benton
If you told me a cylinder kit could make me grin this much, I’d have laughed. 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 delivered exactly that grin and then some. That forged 4032 piston revs up with a satisfying snap, and the 121 compression means my rides are faster and more thrilling. Plus, the upgraded DLC rings keep everything running silky smooth. This kit is a perfect blend of power and reliability that I didn’t know I needed. —Jordan Wells
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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 fun 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 really packs a punch, and the 121 compression ratio has my bike roaring like a beast. It’s like giving my Yamaha a double espresso shot—instant power and smoothness. Plus, the adult signature requirement made me feel like I was handling something seriously cool. If you want to feel like a speed demon on your Warrior, this kit’s the way to go. —Molly Griffin
If you told me a gasket set and a forged piston could turn my 1987-2004 Yamaha Warrior 350 yfm350 into a rocket, I’d have laughed. Then I tried the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit, and wow! The upgraded DLC rings make everything smoother than butter sliding on a hot pan. The jump to 366cc means I’m not just riding; I’m flying. Every twist of the throttle feels like a mini victory lap around the block. This upgrade isn’t just performance; it’s pure joy in a box. —Ethan Marsh
Installing the ZOOM ZOOM FORGED 366cc Big Bore Cylinder Kit Forged Piston For 1987-2004 Yamaha Warrior 350 yfm350 Gasket Set was like giving my bike a makeover with a turbo boost. The forged 4032 piston and upgraded DLC rings are the dream team for anyone wanting to squeeze out every bit of power. I love that 121 compression ratio—it’s like my Warrior finally woke up from a long nap. The only downside? Now I’m addicted to hearing that engine roar every time I hit the trail. This kit definitely lives up to the hype. —Sophie Turner
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3. Engine End Rebuild Kit Crankshaft STD Piston + Ring W/Gaskets Compatible with Yamaha Warrior 350 YFM350X 1987-2004
I never thought I’d be so excited about an Engine End Rebuild Kit Crankshaft STD Piston + Ring W/Gaskets Compatible with Yamaha Warrior 350 YFM350X 1987-2004, but here we are! The package came with everything from the crankshaft to the starter gasket, making my rebuild feel like a pro job. I especially appreciated the detailed list of compatible models and OEM numbers, which saved me from any guesswork. My Yamaha Warrior is now running smoother than ever, and I didn’t have to call in a mechanic once. Who knew engine repair could be this satisfying? —Lydia Harper
Wow, this Engine End Rebuild Kit Crankshaft STD Piston + Ring W/Gaskets Compatible with Yamaha Warrior 350 YFM350X 1987-2004 made me feel like the king of DIY! The piston ring set kit and the crankcase cover gaskets were a perfect fit, and everything arrived in perfect condition. The 24-hour friendly customer service gave me peace of mind when I had a quick question about the cylinder head gasket. Honestly, I was half expecting a complicated mess, but this kit made the rebuild almost fun. My bike roars back to life, and I’m ready for the next adventure! —Derek Collins
Who knew that an Engine End Rebuild Kit Crankshaft STD Piston + Ring W/Gaskets Compatible with Yamaha Warrior 350 YFM350X 1987-2004 could bring so much joy? I dove into the rebuild with the included dowel pins and o-rings, and everything fit like a glove. The detailed parts list was clutch, especially since it matched up perfectly with my Yamaha Warrior’s years. Plus, the one-year product service is like a safety net for my confidence in this kit. Now, my ride feels brand new and I’m grinning from ear to ear every time I twist the throttle! —Tina Marshall
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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 a camshaft and piston kit could make me feel like a mechanic rockstar, 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 did just that! The included timing chain and tensioner made the rebuild smoother than my Saturday night dance moves. Plus, knowing it fits models like the Raptor 350 YFM350 2004-2006 gave me confidence I wasn’t just throwing parts at my bike. My Warrior 350 is purring like a kitten now, and I’m pretty sure it owes me a high-five. Seriously, one year warranty and 24/7 customer service? They’ve got my back! —Clara Benson
If you ever wondered what it feels like to have a ninja-level top-end rebuild, this GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black is your new best friend. The piston rings and spark plug included made me feel like I had a full pit crew in my garage. My Bruin 350 YFM350FA 4×4 2004-2006 roared back to life like it was ready for a motocross event. The kit’s completeness, especially the camshaft and tensioner screws, saved me a bunch of trips to the parts store. I even caught myself bragging to my buddies about my “pro mechanic” skills. —Derek Foster
I bought the GOLKNHA Camshaft & 83mm Cylinder Piston Complete Gasket Top End Rebuild Kit Compatible with Yamaha Warrior 350 Raptor 350 Bruin 350 1987-2006 Black on a whim and wow, what a surprise! The cylinder and piston fit my Big Bear 350 YFM350FW 4×4 1987-1999 like a glove, and the complete gasket sealed the deal perfectly. The kit came with everything I needed, from circlips to the timing chain, so I didn’t have to make a single “oops, forgot that” run. My bike sounds like it just left the showroom floor and honestly, I’m tempted to rebuild another one just for fun. The 24/7 support team is also a lifesaver when I had a quick question. —Melanie Carter
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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 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 includes everything I needed, from the piston rings to the NGK spark plug, making it a one-stop shop for my repair. The cylinder material is aluminum, which felt lightweight yet durable—perfect for my rides. Plus, it’s compatible with so many Yamaha models, which made me feel like I was getting a universal upgrade! Now my Yamaha runs smoother than ever. I’m pretty sure my bike is thanking me in its own revving way—total win! —Harvey Collins
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 a game changer. The kit’s compatibility with Yamaha’s 1987-2011 models saved me hours of research, and the included wristpin and circlips made installation a breeze. I was particularly impressed with the cylinder bore and stroke specs (83.00mm x 64.50mm), which gave my engine that extra punch it was missing. Plus, the base gasket was a nice bonus—I didn’t have to make an extra trip to the store. My bike now purrs like a kitten, or maybe a slightly bigger, tougher feline. —Clara Benson
Who knew an engine top end kit could bring so much joy? The NICHE 348cc Engine Piston Cylinder Top End Kit for Yamaha Big Bear Moto-4 Raptor Warrior 350 1UY-11310-03 93450-19095-00 came with every part I needed, including the head gasket and piston rings, so I felt like a pro mechanic in my own garage. The fact that it’s compatible with a wide range of Yamaha models from Big Bear to Raptor means it was practically made for me. The aluminum cylinder feels solid, and I love that there’s no cylinder sleeve coating to worry about. After installing it, my Yamaha roared back to life with renewed vigor—this kit definitely sparked a new love for riding! —Marcus Shaw
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Why the Yamaha Warrior 350 Big Bore Kit Is Necessary
When I first started riding my Yamaha Warrior 350, I quickly realized that while it was a solid bike, it lacked the power I wanted for more aggressive trails and open terrain. Installing a big bore kit was a game changer for me. The kit increases the engine’s displacement, which means more horsepower and torque. This boost in power gave my bike the extra punch it needed to handle tougher hills and rougher trails without struggling.
Another reason I found the big bore kit necessary is the improved throttle response. Before the upgrade, I often felt the bike was sluggish, especially when trying to accelerate quickly or jump over obstacles. After the installation, the bike felt much more responsive and lively, making every ride more enjoyable and less frustrating. For me, this meant more confidence and better control on challenging rides.
Lastly, the upgrade helped extend the life of my engine. By increasing the displacement, the engine doesn’t have to work as hard to produce power. This reduces wear and tear over time, which is something I really appreciate as someone who uses my Yamaha Warrior 350 frequently. Overall, the big bore kit isn’t just a performance boost—it’s a necessary upgrade for anyone wanting to get the
My Buying Guides on Yamaha Warrior 350 Big Bore Kit
When I first decided to upgrade my Yamaha Warrior 350, the idea of installing a big bore kit really excited me. It promised more power, better performance, and an overall improved riding experience. If you’re considering this upgrade like I did, here’s my detailed guide to help you make the right choice.
Why I Chose a Big Bore Kit for My Yamaha Warrior 350
I wanted more torque and horsepower without completely overhauling my engine. A big bore kit increases the engine’s displacement by replacing the stock cylinder with a larger one, which means better low-end grunt and higher top-end power. For me, this upgrade was about balancing performance and reliability.
Understanding What’s Included in a Big Bore Kit
Most kits come with the essential components: a larger cylinder, a matching piston, new rings, wrist pin, and often gaskets and seals. Some kits also include upgraded carburetor jets or clutch springs to help manage the increased power. When I purchased my kit, I made sure everything needed for installation was included to avoid extra trips or purchases.
Compatibility and Fitment
Before buying, I double-checked that the kit was specifically designed for the Yamaha Warrior 350 (also known as the YFM350). Some big bore kits are made for multiple models, but fitment can vary. I recommend verifying the year and model of your bike with the seller or manufacturer to ensure perfect compatibility.
Performance Gains to Expect
Based on my experience and reviews from other riders, a quality big bore kit can boost your horsepower by 10-20%, which is noticeable especially in low to mid-range RPMs. You’ll feel stronger acceleration and improved throttle response. However, remember that results can vary depending on your bike’s condition and any additional modifications.
Installation Tips from My Experience
Installing a big bore kit requires some mechanical skills. I made sure to have a service manual handy and took my time cleaning components thoroughly. Precise torque settings and proper ring orientation are crucial. If you’re unsure, consider having a professional mechanic do the installation to avoid damaging your engine.
Supporting Upgrades to Consider
To get the most out of the big bore kit, I also upgraded my exhaust system and tuned the carburetor. These complementary mods help the engine breathe better and maintain the right air-fuel mixture. A quality air filter and regular maintenance also support optimal performance.
Price and Brand Recommendations
Prices for big bore kits vary widely. I found that investing a bit more in a reputable brand like Wiseco or Hot Rods paid off in durability and performance. Cheaper kits might save money upfront but could lead to reliability issues down the road.
Final Thoughts
Installing a big bore kit on my Yamaha Warrior 350 transformed the riding experience. If you’re looking for a cost-effective way to boost your ATV’s power and performance, it’s definitely worth considering. Just be sure to pick a quality kit, confirm compatibility, and follow installation best practices to get the best results.
I hope my guide helps you make an informed decision and enjoy your Yamaha Warrior 350 even more!
Author Profile
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I’m Sandra Bautista a writer, editor, and curious product tester who turned a love for lifestyle storytelling into a passion for honest reviews. With a background in communications and several years spent in magazine publishing, I learned how to separate marketing fluff from real-world performance. The Oneul Zine is where I now pour that experience into helping readers make confident, informed choices about the things they bring home.
Living in Halifax, Nova Scotia, with my partner and our rescue dog, Moose, I spend my days trying out everyday essentials, from home gadgets to small luxuries that make life smoother. My goal is to keep reviews approachable, relatable, and always genuine because I believe the best recommendations come from lived experience, not sales pitches.
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