Description

Keep Your Kawasaki Mule SX Ready for the Next Job

The Kawasaki Mule SX 4×4 FJ400 is built for everyday utility work, from maintaining property to hauling equipment and supplies. If your engine has become harder to start, is using oil, or has lost power over time, rebuilding your original engine can be a dependable alternative to replacing your vehicle.

Our Build Core program centers around your engine. After it arrives at REV6, we inspect every major component, perform the required machine work, complete the rebuild, and finish with a thorough quality inspection before shipping it back.

Service Information

• Service: Build Core Engine Rebuild
• Fits: Kawasaki Mule SX 4×4 FJ400 (2016–2025)
• Core Required: Yes
• Warranty: 1-Year No-Fault Warranty Included
• Optional Coverage: 2-Year No-Fault Warranty Available
• Financing: Available
• Shipping: Nationwide with tracking information provided

Work Performed During Your Rebuild

• Complete inspection of the engine core
• Crankshaft and connecting rod inspection
• Cylinder bore machined and honed as needed
• New piston and piston rings
• Complete gasket kit
• New oil seals and valve guide seals
• Cylinder head service with valves ground and valve lash adjusted
• Final quality inspection before shipment

About Your Engine Core

A rebuildable Kawasaki Mule SX 4×4 FJ400 engine core is required for this service. Once we receive your engine, we’ll inspect its condition and confirm the work needed before moving forward with the rebuild.

If you’re unsure whether your core is rebuildable, Contact REV6. Our team is happy to answer questions before your engine ships.

Coverage & Payment Options

Your rebuilt engine is backed by a 1-Year No-Fault Warranty. For additional peace of mind, you can also choose our optional 2-Year No-Fault Warranty.

For complete warranty details, visit our Warranty Policy. Financing options are available through our Financing page.

Need Parts for Your Current Engine?

If you’re repairing your engine instead of sending it in for rebuilding, browse our Kawasaki Mule engine parts and rebuild kits. You can also compare available options in our Engine Rebuild Kit Guide.

Send Your Engine When You’re Ready

Once your order is placed, send us your rebuildable engine core and we’ll handle the inspection, rebuilding, and final testing before returning it to you.

As part of our commitment to those who have served, qualifying veterans and active-duty military personnel can receive special REV6 pricing. Contact our team for details.