NAMURA PISTON, GASKET, CYLINDER JUG YAMAHA BIG BEAR 350 BRUIN 350 WOLVERINE 350

Revitalize the heart of your Yamaha ATV with the NAMURA Piston, Gasket, and Cylinder Jug Kit, engineered to deliver OEM-level performance with upgraded durability and efficiency. Specifically crafted for the Yamaha Big Bear 350, Bruin 350, and Wolverine 350, this comprehensive top-end rebuild kit is the ideal solution for riders dealing with loss of compression, decreased engine output, oil leaks, or engine wear due to age and use.

Whether you’re restoring an aging ATV for work, trail riding, or hunting, this kit ensures you’re equipped with components built for longevity, reliability, and power. Each piece in this NAMURA kit is manufactured with advanced materials and modern engineering practices, guaranteeing performance that meets or exceeds original factory specifications.NAMURA PISTON, GASKET, CYLINDER JUG YAMAHA BIG BEAR 350 BRUIN 350 WOLVERINE 350

🏭 Manufacturing Process & Material Properties:

• The NAMURA piston is forged from hypereutectic aluminum alloy, offering a significantly higher silicon content than standard cast pistons. This material increases thermal resistance and structural integrity, reducing expansion under heat for tighter tolerances and consistent performance.

• The piston features a MOS2 (Molybdenum Disulfide) / Teflon coating on the skirt, which minimizes friction, improves heat transfer, and reduces wear during high-load operations. This results in smoother engine operation and extended piston life, even under demanding off-road conditions.

• The cylinder jug is CNC-machined and honed to exact OEM tolerances. It is cast from high-strength aluminum with a nickel-silicon carbide (Nikasil) or steel sleeve liner for superior wear resistance, heat dissipation, and oil retention. The machined crosshatch promotes proper oil film adhesion, aiding piston ring seating during break-in.

• The gasket kit includes high-performance top-end gaskets manufactured using multi-layer steel (MLS) or fiber-reinforced composite materials, designed to handle high temperatures and pressures, resist blowouts, and maintain proper sealing through heat cycles.

Each kit is quality-control tested at every stage—from raw material processing to final assembly—to ensure dimensional accuracy and consistent reliability. NAMURA applies rigorous standards during production, including stress testing, hardness evaluation, and thermal simulations, to ensure the kit performs in even the most rugged riding environments.

🔧 Uses & Applications:

• Top-End Rebuilds: Ideal for riders experiencing compression loss, engine smoking, or decreased throttle response.

• Engine Overhauls: Perfect for restoring used or aging ATVs to like-new condition.

• Performance Maintenance: Excellent for preventative maintenance to avoid catastrophic engine failure.

• Workhorse Utility Use: Built to handle the demands of hauling, towing, and daily farm/ranch tasks.

• Recreational Trail Riding: Durable enough for the roughest terrain, mud, and backcountry trails.

✅ Kit Includes:

• NAMURA Hypereutectic MOS2-Coated Piston

• Precision-Cast and Honed Cylinder Jug

• Complete Top-End Gasket Kit (Head, Base, Valve Seals)

• Piston Rings, Wrist Pin, and Circlips

🛠️ Compatible Yamaha Models:

• Yamaha Big Bear 350 (All applicable years)

• Yamaha Bruin 350 (All applicable years)

• Yamaha Wolverine 350 (All applicable years)

Confirm specific year compatibility before installation.

🔍 Key Benefits:

• Improved compression and engine response

• Reduced wear and thermal expansion

• Extended engine life and smoother performance

• Easy bolt-on OEM-style installation

• Cost-effective solution for full top-end replacement