400EX 400X Head Redo Valves Intake Exhaust Valve Springs Rocker Arms Rebuild Kit
30-3111,30-3115,30-3117,14711-KCY-670,14721-KCY-670 8400003-2, 8400003-1,VES003, VIS003,X2VEK16000,X2VIK16000 28.1495-2, 28.1495-1,14711-KCY-670, 12209-KL4-005,4721-KCY-670,12209-KL4-005, 193564323972, 28.1495-2, 28.1495-1,14711-KCY-670, 28.1495-2, 71016-4, 14711-KCY-670, 12209-KL4-005, 30-3115,30-3117,8400003-2, 8400003-1,VES003, VIS003,X2VEK16000,X2VIK16000
Complete 400EX/400X/XR400R Engine Rebuild Kit – Premium Valve & Rocker Arm Components, Fits All Models & Years
Upgrade, restore, and maximize the performance of your Honda 400EX, 400X, or XR400R with the Ultimate Engine Rebuild Kit – the only truly complete solution on the market. Whether you're an off-road enthusiast or a performance-driven rider, this meticulously designed kit has everything you need to breathe new life into your engine and enjoy a smoother, more powerful ride.
Featuring precision-engineered steel intake and exhaust valves, valve springs, rocker arms, and every necessary component to ensure a reliable and durable engine rebuild, this kit is designed to fit ALL Honda 400EX, 400X, and XR400R models and years.
What’s included:
High-quality steel intake & exhaust valves for lasting performance
Complete inner & outer valve spring assembly for enhanced durability
Sturdy rocker arms, shafts, and wave washers for peak efficiency
Advanced Viton valve stem seals to prevent oil leaks
All essential hardware: valve keepers, base washers, retainers, circlips, and springs
Why choose us?
✔ Engineered for perfect compatibility with your Honda head
✔ Backed by a 1-year warranty for peace of mind
✔ The most comprehensive rebuild kit online—no extra parts needed
Rebuild your ATV or dirt bike with confidence and enjoy smoother starts, boosted power, and improved reliability on every ride. Don’t settle for incomplete kits—unlock the full potential of your engine now!
