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The Best Parts • The Best Performance • The Best PriceBPRATV Yamaha Banshee 350 66mm Top End Rebuild Kit ProX Pistons Bearings Cometic
Build a stronger Yamaha Banshee with a 370cc 66mm big bore top end kit. ProX pistons, bearings, and Cometic gaskets included.
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.
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.
Photos Are For Example Only Images show product quality, components, and visual reference. Exact parts, brands, finishes, quantities, or packaging may vary by kit. Please read the full product description for exact details before purchasing.Complete Your Build
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Built around proven parts, real-world support, and the performance-focused service riders expect from BPRATV.
Performance Parts SpecialistsUSA Based Company
Worldwide ShippingTechnical Support AvailableTrusted by RidersBPRATV - The Best Parts. The Best Performance. The Best Price.
BRAPPPPPPPPPP!Professional Installation Required
Professional installation by a qualified technician is recommended for best results.
If you have questions about this item or your order, our customer support team is always happy to help.
BPRATV: Over 20 Years of Excellence in Parts & Service
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Notice Regarding Photos: Product photos used in our listings are for example only to show item quality, components, and visual reference. You will receive the correct quantity, size, and fitment for the specific kit listed. Exact brands, finishes, packaging, or small components may vary when equivalent-quality parts are used. Please read the full product description for exact details before purchasing.
Bearing Notice: In some cases, you may receive sealed bearings. If your application requires an open bearing, the seals can be removed when appropriate for the application.
Emissions & Race Use Only: Some products may be exempt from emission standards and requirements under 40 C.F.R. § 1051.620 and/or applicable California law. Certain parts are sold only for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed-course, nonroad competition/racing. Installation may void the vehicle manufacturer\'s warranty and/or may be illegal in some locations. Buyer is responsible for confirming legal use in their application and location.
Warranty & Liability: Due to the nature of high-performance and racing applications, components may be sold without express or implied warranty of merchantability or fitness for a specific purpose except where specifically stated. BPRATV LLC shall not be liable for special, incidental, or consequential damages including loss of property, equipment, profits, or revenue resulting from sale, installation, or use of these parts. High-performance parts are not DIY items; work should be performed by a qualified, experienced mechanic.
Returns: Returns are accepted within 30 days for eligible items that are 100% complete, brand new, unused, uninstalled, and in original packaging. Items that have been installed, prepped, lubricated, sealed, modified, or used are not eligible. For warranty consideration, parts must be sent back for physical inspection. We do not warranty based on photos, emails, or third-party assessments.
Specialty Warranties: Certain specialty items, such as Cub cylinders or titanium fasteners, may have separate warranty terms. Any warranty does not cover improper tuning, installation, maintenance, or misuse.
Interchangeable Parts: Some kits may include interchangeable components or equivalent-quality substitutions to prevent backorder delays. Prices, included items, and listings are subject to change without notice.
Customer Satisfaction: If you experience any issue with your order, please contact us through Messages before leaving response. Our team is committed to resolving any concerns quickly and professionally.
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