Description

Turn your Polaris 570 into a powerhouse with the REV6 625cc Big Bore Engine Rebuild Kit. Designed for 2012–2017 Polaris Ranger and RZR models, this performance-driven rebuild kit delivers serious gains in horsepower, torque, and overall reliability. It’s the ultimate upgrade for riders who want more grunt without sacrificing dependability.

With precision-machined components and big bore engineering, this kit boosts your engine displacement to 625cc, improving throttle response and pulling power. Every part meets or exceeds OEM standards, ensuring a smooth fit, long service life, and confident performance on any terrain. Installation is straightforward, and each kit is backed by our 1-year warranty for total peace of mind.

This Kit Includes:

• (1) Wossner Piston Kit (Big Bore) — Replaces OEM #: 89551D500
• (1) Cylinder (Big Bore) — Replaces OEM #: 760-16-11301
• (1) Timing Chain — Replaces OEM #: 3222196
• (2) Exhaust Valves — Replaces OEM #: 183-09190E
• (2) Intake Valves — Replaces OEM #: 183-09190
• (1) Oil Seal Set — OEM replacement
• (2) Ball Bearings — Replaces OEM #: 3514389
• (1) Crankshaft — Replaces OEM #: 421-4429
• (1) Top End Gasket Kit — OEM-style fit
• (1) Valve Cover Gasket — Replaces OEM #: GT570-08

Built for Serious Riders

REV6 brings years of experience rebuilding and upgrading Polaris 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 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.