Description

Rebuild your engine’s head from the ground up with the REV6 Master Top End Rebuild Kit for the Can-Am Outlander 850 (2016–2025). This kit contains all the parts needed to restore your top end’s integrity, from cylinders and pistons to valves and gaskets.

Every component is built to factory spec and tested for quality before shipping. Because of this, you’ll see proper sealing, reliable compression, and consistent performance. The included gasket set, pistons, cylinders, and valves all work in harmony. The kit ships nationwide with a 1-year warranty, and you may add a 2-year no-fault upgrade for extended protection. With REV6’s experience in Powersports engines and parts, you can trust each component to perform under real conditions.

Need install tips, torque specs, or part fit guidance? See our REV6 Blog for rebuild how-tos, or check our FAQ section for fast answers. You can also reach our support team through the Contact page. Therefore, whether your build is for competition or longevity, this kit sets you up with reliable parts and clarity.

This Kit Includes:

• (1) Top End Gasket Set — OEM-matched
• (2) Piston Kits — Replaces OEM#: 420686310
• (1) Rear Cylinder — Replaces OEM#: 420413269
• (1) Front Cylinder — Replaces OEM#: 420413263
• (4) Intake Valves — Replaces OEM#: 420254367
• (4) Exhaust Valves — Replaces OEM#: 420855029

Take Action

Place your order today and get parts that rebuild, restore, and last. For warranty specifics, visit our warranty policy or learn more about our core return program.

Need assistance with payment or shipping? Explore our financing options or visit the Help Center. Because your rebuild matters, we support you from order to installation.

Thank you for choosing REV6 — trusted by riders who expect durability, precision, and performance from their Powersports engines and parts. We proudly support veterans and servicemembers with exclusive discounts as our way of showing thanks.