Description

Yamaha Banshee 350 | Upgraded with a Big Bore Top End

Is your Yamaha Banshee in need of a refresh? Upgrade your capacity to 400cc with this kit. Do yourself and your Banshee right by boosting the performance of your engine with an upgraded master top-end rebuild kit. This big-bore kit will deliver more power without the hassle of having to make modifications to your bottom end.

With precision-machined components and big-bore engineering, this kit boosts your engine displacement to 400cc, improving throttle response and pulling power. Every part meets or exceeds OEM standards, ensuring a smooth fit, long service life, and confident performance. Installation is straightforward, and each kit is backed by our 1-year warranty for total peace of mind.

This upgrade kit includes:

• (2) New 68mm nikasil-plated cylinders
• (2) 68mm piston kits (pistons, rings, circlips, wrist pins) (11.9:1 compression)
• New cylinder head with combustion chamber domes
• Top-end gasket set and o-rings
• New cylinder/head studs
• New cylinder head nuts and washers

Built for Serious Riders

REV6 brings years of experience rebuilding and upgrading Banshee engines, using advanced machining and testing to ensure every component performs under pressure. For full coverage details, visit our Warranty Policy. Need help choosing the right rebuild kit? Explore our Engine Rebuild Kit Guide. Need help assembling the top end? Give us a call to discuss build and warranty options!

Need Assistance?

Visit our Help Center for shipping and installation info, or reach out through our Contact Page for one-on-one support. Financing is available through our Financing Options, and you can review our Core Program to understand how we handle core returns. For quick answers, see our FAQ section.

Thank you for choosing REV6 — the trusted name in Powersports engines and parts. We proudly support veterans and servicemembers with special discounts as our way of saying thanks for their service.