Description

Polaris Ranger / Sportsman 450 & 500 Complete Bottom End Rebuild Kit (2017–2022)

When your rebuild starts at the foundation of the engine, this Complete Bottom End Rebuild Kit brings together the major lower-end components commonly replaced during service. Designed for applicable 2017–2022 Polaris Ranger and Sportsman 450 / 500 models, this package focuses on the rotating assembly, timing system, sealing components, and lower-end reliability.

Instead of tracking down multiple individual parts, this kit helps simplify planning and keeps your rebuild moving.

This Kit Includes

• Timing Chain
• Crankshaft
• Crankshaft Ball Bearings
• Water Pump Seal Kit
• Complete Gasket Kit

Fitment

• Polaris Ranger 450
• Polaris Ranger 500
• Polaris Sportsman 450
• Polaris Sportsman 500
• Applicable 2017–2022 models

Built Around the Rotating Assembly

The bottom end handles the constant load of transferring power through the crankshaft and supporting engine balance. Replacing worn rotating components, bearings, and sealing surfaces together can help support smoother operation and reduce repeat teardown work later.

This kit is a strong option for rebuild projects focused on restoring lower-end performance without moving into a full top-end package.

Helpful Related Parts

• Polaris Prostar Crankshaft
• Engine Rebuild Kit
• Complete Engine Rebuild Kit + Tensioner
• Polaris Prostar Timing Chain
• Polaris Ranger 450/500 Gasket Seal Kit

Need help selecting bearing sizes? Review the Polaris Crankshaft Bearing Mapping Guide.

If you’re deciding between rebuild levels, review our Engine Rebuild Kit Guide.

Support & Resources

Need help confirming fitment or planning your rebuild? Visit Contact REV6.

You can also review our Warranty Policy, browse the FAQ, or visit the Help Center.

Need additional flexibility for your rebuild project? Explore our financing options.

Take Action

Order your Polaris Ranger / Sportsman 450 & 500 Complete Bottom End Rebuild Kit and rebuild with confidence using components selected to support your next engine project.

Thank you for choosing REV6 — your trusted source for high-performance powersports engines and parts. Proudly supporting U.S. veterans and servicemembers with special discounts.