Honda 400EX Engine Rebuild Services, Parts & Complete Rebuild Kits

The Honda 400EX Engine Rebuild category gives you everything needed to repair or rebuild your ATV. Send your engine core to REV6 for an in-house rebuild, or shop premium engine parts and rebuild kits for your next project.

Every engine is rebuilt in our Utah facility by experienced technicians. Each build follows a detailed inspection process before it ships. We also offer top end kits, bottom end kits, replacement engine parts, and complete rebuild kits. Every qualifying engine and part is backed by our industry-leading 1-year no-fault warranty. Plus, we ship nationwide, and our online store is open 24/7.

Trusted Support from Experienced Powersports Engine Builders

Whether you maintain your own Honda 400EX or manage repairs for customers, our team is ready to help. Our sales and customer service staff answer questions by phone or text Monday through Friday from 8:00 AM to 5:00 PM Mountain Time. Visit our Contact REV6 page, review our Warranty Information, or explore financing options before placing your order.