Description

Polaris 800 Complete Top End Rebuild Kit (RZR / Ranger / Sportsman 2004–2012)

When your Polaris 800 starts losing compression, running rough, or burning oil, the top end is usually the problem. Instead of replacing one part at a time, this complete top-end kit gives you the key components needed to fix it properly.

By replacing the cylinder, pistons, and gaskets together, you avoid uneven wear and sealing issues. As a result, compression stabilizes, break-in improves, and the engine runs cleaner after reassembly.

This Kit Includes

• New cylinder
• Top end gasket set
• Moly upgraded pistons

Why Replace the Full Top End?

Mixing old and new parts often leads to poor sealing and inconsistent performance. However, when you install a matched set, everything works together the way it should. That means better compression, smoother operation, and fewer issues after the rebuild.

Built for Reliable Results

This kit focuses on the components that directly impact combustion and sealing. Because of that, it’s the right choice when the top end is worn, damaged, or already apart.

Warranty Coverage

All REV6 parts kits include a 1-year warranty for added confidence.

Review full details on our warranty policy, visit the FAQ page, or contact our team if you need help before ordering.

Need More Than a Top End?

If you’re planning a full rebuild or need additional components like crankshafts, transmissions, valves, clutch parts, ECU tune kits, or bottom end rebuild kits, browse your model below:

• Polaris RZR 800 parts & rebuild kits
• Polaris Ranger 800 parts catalog
• Polaris Sportsman 800 parts catalog

Fitment

Polaris RZR / Ranger / Sportsman 800
2004–2012 Models

Take Action

If your engine is already apart or showing signs of top-end wear, now is the time to fix it right. This kit ships nationwide and is ready to install—get your Polaris 800 back to running strong.

We proudly support veterans and active servicemembers with available discounts—thank you for your service.