BPRATV Yamaha Banshee 350 66mm Top End Rebuild Kit ProX Pistons Bearings Cometic

Yamaha Banshee 66mm Big Bore Top End Kit – 370cc ProX Pistons, Bearings & Cometic Gaskets

🔥 High-Performance 370cc Big Bore Rebuild Kit

Unleash more power and torque from your Yamaha Banshee with this premium BPRATV 66mm Big Bore Top End Kit. Built around the same trusted ProX pistons and components you expect, this 370cc big bore setup delivers increased displacement, stronger mid-range, and race-proven durability for riders who want more than stock performance.

🔥 Key Features & Benefits

Engineered for riders who demand big bore power with OEM-level fitment and reliability.

• Includes BPRATV 66mm Big Bore Banshee Cylinders (Set) – 370cc total displacement
• ProX 66mm Pistons Set – complete with rings, wrist pins, and circlips (Made in Japan)
• ProX or Wiseco Wrist Pin Bearings / Top End Bearings* – precision-made in Japan
• Cometic Top End Gasket Kit – race-proven sealing for big bore applications
• Designed for increased horsepower, torque, and throttle response

✅ Compatibility

Built to bolt directly onto your Banshee with proper supporting modifications.

• Fits all Yamaha Banshee 1987–2006 models
• Compatible with stock or aftermarket stock-stroke crankshafts
• Designed for use with big bore–compatible cylinder heads or domes
• Ideal for dune, drag, trail, and race builds
• Carburetor jetting and tuning required for best performance

❓ Frequently Asked Questions (FAQ)

• Q: What size is this big bore kit?
  A: This kit uses a 66mm bore for approximately 370cc total displacement.
• Q: Are the pistons the same ProX quality as stock kits?
  A: Yes. These are genuine ProX pistons made in Japan, matched specifically for the 66mm big bore.
• Q: Does this kit require carb or head changes?
  A: A big bore–compatible head, or cool head with correct size domes, and proper carb jetting are recommended to maximize performance.
• Q: Is this kit suitable for racing?
  A: Absolutely. This 370cc big bore kit is designed for high-performance and competitive riding.

🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. With years of hands-on experience building high-performance ATV engines, we deliver proven parts you can trust. Trust BPRATV to keep your Yamaha Banshee running at its best, every single time.

🛒 Upgrade to a 370cc big bore today and feel the difference every time you hit the throttle!

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.