Description

Rebuild your engine’s top end with confidence using the REV6 Complete Top End Rebuild Kit for the 2016–2025 Outlander 850. This kit gives you all the critical components needed to restore compression, sealing, and performance at the cylinder head.

Each part is made to match factory tolerances and goes through quality checks before shipping. As a result, you’ll get tight sealing, reliable operation, and long-lasting performance. The kit ships nationwide and includes a 1-year warranty. If you want extra coverage, you can upgrade to a 2-year no-fault plan. Because REV6 has decades of experience in Powersports engines and parts, we back every component we send you.

Need help with specs, installation, or part fitment? Visit our REV6 Blog for rebuild guides or check our FAQ section for quick answers. You can also reach us through the Contact page. Therefore, whether you’re doing this rebuild yourself or in a shop, this kit supports your work every step of the way.

This Kit Includes:

• (1) Top End Gasket Kit — OEM-matched
• (2) Piston Kits — Replaces OEM#: 420686310
• (1) Rear Cylinder — Replaces OEM#: 420413269
• (1) Front Cylinder — Replaces OEM#: 420413263

Take Action

Order your Complete Top End Rebuild Kit today and give your Outlander 850 a fresh top-end foundation. For warranty details or core program info, check our warranty policy or core return program.

If you need help with financing or shipping options, see our financing page or visit the Help Center. Because we support your build from start to finish, you’ll never be left without guidance or coverage.

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