Raptor 660 102mm 686 Big Bore Cylinder Wiseco Piston Cometic Top End Rebuild Kit

BPRATV Yamaha Raptor Rhino Grizzly 660 686cc 102mm Big Bore Cylinder Wiseco Piston Cometic Top End Rebuild Kit

📖 Product Description

Unlock the full potential of your Yamaha 660 engine with this premium BPRATV 686cc Big Bore Top End Rebuild Kit. Featuring a 102mm (+2mm) BPRATV big bore cylinder, a Wiseco forged high-compression piston kit, and a Cometic MLS top end gasket kit, this complete package is engineered to deliver increased horsepower, stronger torque, improved throttle response, and outstanding long-term reliability.

Designed as a true drop-in, bolt-on upgrade, this 686cc conversion requires no crankcase machining or case modifications. Whether you're rebuilding a worn engine or upgrading for trail riding, dunes, racing, mud, or utility work, this kit provides industry-leading performance using components trusted by professional engine builders nationwide.

🔥 Key Features & Benefits

• 686cc displacement upgrade increases horsepower and torque throughout the RPM range.
• 102mm BPRATV Big Bore Cylinder provides a direct bolt-on installation.
• Wiseco forged piston delivers superior strength, durability, and heat resistance.
• 10.5:1–11:1 compression ratio (actual compression may vary slightly depending on the exact vehicle model and model year) provides excellent power while remaining pump-gas friendly for most applications.
• Cometic complete top end gasket kit featuring a premium MLS (Multi-Layer Steel) head gasket for exceptional sealing under high cylinder pressures.
• No crankcase machining required--true drop-in, bolt-on installation.
• Ideal for performance builds, engine rebuilds, trail riding, dune riding, mud riding, racing, and utility applications.
• 1-Year Manufacturer Warranty for added confidence and peace of mind.*

📦 Product Contents

• BPRATV 102mm (+2mm) 686cc Big Bore Cylinder
• Wiseco 102mm Forged Big Bore Piston Kit (includes OEM-spec piston rings, wrist pin, and circlips)
• Cometic Complete Top End Gasket Kit with 102mm MLS Head Gasket

🔧 Technical Specifications

• Displacement: 686cc
• Cylinder Bore: 102mm (+2mm)
• Compression Ratio: 10.5:1–11:1
• Piston Material: Forged Aluminum
• Head Gasket: MLS (Multi-Layer Steel)
• Installation: Drop-In / Bolt-On
• Case Machining Required: No

✅ Compatibility

Fits all years and models equipped with the Yamaha 660 engine.

• Yamaha Raptor 660 (All Years)
• Yamaha Rhino 660 (All Years)
• Yamaha Grizzly 660 (All Years)

❓ Frequently Asked Questions

• Q: Does this require machining the engine cases?

  A: No. This kit is a true drop-in, bolt-on 686cc conversion requiring no crankcase modifications.

• Q: Does the piston kit include rings and wrist pin?

  A: Yes. The Wiseco piston kit includes piston, OEM-spec piston rings, wrist pin, and circlips.

• Q: Is the MLS head gasket included?

  A: Yes. A Cometic 102mm MLS head gasket is included as part of the complete top end gasket kit.

• Q: Is this suitable for high-performance riding?

  A: Absolutely. This combination is designed for aggressive trail riding, racing, dune riding, mud riding, and performance engine builds.

🌟 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 premium ATV and motocross engine components trusted by riders and builders nationwide. Our kits combine industry leading brands when applicable to deliver reliability and performance you can trust. Trust BPRATV to keep your Yamaha Raptor 660, Rhino 660 & Grizzly 660 running at its best, every single time.

Upgrade your Yamaha 660 with the proven power of a 686cc big bore kit--order today and experience the difference!

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

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© 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.