Raptor YFM350 Big Bore Kit 85mm Cylinder Complete 370cc Engine Motor Rebuild Kit

Yamaha Raptor 350 Warrior 350 370cc Big Bore Engine Rebuild Kit 85mm

📖 Product Description

Upgrade your ATV’s performance with this Raptor YFM350 370cc Big Bore Engine Rebuild Kit, engineered for riders who demand more power, torque, and reliability. Featuring a precision-machined 85mm big bore cylinder and JE forged piston, this kit transforms your stock engine into a high-performance powerhouse.

Designed as a direct bolt-on upgrade, this complete rebuild kit eliminates the need for machining while delivering increased displacement and improved throttle response. Whether you're rebuilding, racing, or restoring your ATV, this kit provides everything needed for a full engine refresh with long-lasting durability.

🔥 Key Features & Benefits

Built for performance and reliability, this complete kit includes premium components to ensure maximum output and longevity.

• 85mm big bore design increases displacement to 370cc for more power
• JE forged piston delivers strength, durability, and heat resistance
• Heavy-duty crankshaft assembly ensures long engine life under load
• Direct bolt-on installation with no machining required
• Compatible with pump gas or race fuel for versatile performance

📦 Product Contents

This complete engine rebuild kit includes all essential components needed for a full rebuild:

• Aftermarket 85mm big bore cylinder
• JE forged piston
• High-temperature piston rings
• Chrome wrist pin and circlips
• Hot Rods or Wiseco heavy-duty crankshaft with rod
• Complete gasket kit
• Complete seal kit
• Crank bearings and balancer bearings
• Transmission bearings
• Head stud kit
• New timing chain

✅ Compatibility

Designed for a wide range of Yamaha ATV models for maximum fitment versatility.

• Yamaha Raptor 350 (All Years)
• Yamaha Warrior 350 (All Years)
• YFM350 Engine Platforms
• Direct bolt-on replacement for stock engine components
• No machining required for installation

❓ Frequently Asked Questions (FAQ)

• Q: Does this kit require machining?

  A: No, this is a direct bolt-on kit designed for easy installation without machining.

• Q: What fuel can I run with this kit?

  A: The piston is compatible with both pump gas and race fuel.

• Q: Is everything included for a full rebuild?

  A: Yes, this kit includes all major internal components, gaskets, seals, and bearings.

• Q: Are the parts new and covered by warranty?

  A: Yes, all parts are brand new and include manufacturer warranty coverage.

🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. We specialize in high-performance ATV components designed to deliver real-world results. Every kit we offer is carefully selected to ensure maximum reliability, power gains, and rider satisfaction. Trust BPRATV to keep your Yamaha Raptor 350 running at its best, every single time.

Upgrade your engine today and experience the power of a true 370cc big bore build!

BPRATV - The Best Parts. The Best Performance. The Best Price.

BRAPPPPPPPPPP!

© BPRATV LLC 1-year limited warranty from the manufacturer for material or workmanship defects.* Due to the nature of high performance and racing applications, BPRATV LLC components are sold without express warranty or any implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not, under any circumstances, be liable for any specific, incidental or consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue(s), cost of purchased or replacement goods, or claims of customers of the purpose, which may arise and/or shall result from sale, installation or use of these parts. Installation of these parts may void vehicle manufacturers warranty coverage and/or may cause the vehicle to be illegal in some locations.

This product is exempt from the emission standards and related requirements of 40 C.F.R. § 1051 as provided by 40 C.F.R. § 1051.620, and California law [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and/or federal noise or emission standards/regulations. Purchasers who/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition/racing vehicles as interpreted under applicable state and/or federal law.