Description

Built Around Your Original Kawasaki Mule SX FI 4×4 XC Engine

A tired engine doesn’t always mean it’s time to replace your utility vehicle. Our Build Core service restores your original Kawasaki Mule SX FI 4×4 XC FJ400 engine so you can get back to work with the engine designed for your Mule.

Every rebuild begins with your engine core. From there, our technicians inspect each major component, perform the required machine work, assemble the engine, and complete a final quality inspection before it leaves our shop.

Service Overview

• Service: Build Core Engine Rebuild
• Fits: Kawasaki Mule SX FI 4×4 XC FJ400 (2019–2023)
• 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

What’s Performed During the Rebuild

• Complete engine core inspection
• 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

How the Build Core Program Works

Send us your rebuildable engine core, and we’ll handle the rest. After the inspection is complete, we’ll rebuild your engine using quality replacement components before preparing it for shipment back to you.

Have questions before sending your engine? Contact REV6, and we’ll help you understand the rebuild process and answer any questions about your core.

Warranty & Payment Options

Your rebuilt engine is backed by our 1-Year No-Fault Warranty, with the option to upgrade to a 2-Year No-Fault Warranty for even more coverage.

Visit our Warranty Policy for complete details, or explore available payment plans on our Financing page.

Looking for Engine Components?

If you’re tackling the repair yourself, browse our Kawasaki Mule engine parts and rebuild kits. Our Engine Rebuild Kit Guide can also help you choose the right option for your project.

We’re Ready When Your Engine Is

Ship us your rebuildable engine core when you’re ready, and we’ll return it rebuilt, inspected, and ready for installation.

REV6 is proud to support those who serve. Ask about available discounts for qualifying veterans and active-duty military personnel when placing your order.