Name: Honda TRX 400EX/400X 89mm 440cc Top End Rebuild Kit
Brand: AZ
Price: 574.98 USD
Availability: InStock

Honda TRX 400EX/400X 89mm 440cc Top End Rebuild Kit

$484.69

Tax included. Shipping calculated at checkout.

Select Piston Kit

Wiseco 11:1 Compression (Pump Gas) Part #4667M08900

CP Carrillo 11.5:1 Compression (Pump Gas) Part #M2033

JE 10.8:1 Compression (Pump Gas) Part #247612

JE 12:1 Compression (Race Gas) Part #208552

Add HotCams Timing Chain

Add Timing Chain YES (HotCams)

No Timing Chain I'm Good

Add Heavy Duty Stud Kit

Add Heavy Duty Stud Kit YES

I Don't Need No Stinking Stud Kit

More payment options

🛠️ 440cc Big Bore Top End Rebuild Kit for Honda TRX 400EX/400X

Upgrade your Honda TRX 400EX or 400X with our complete 89mm 440cc big bore top end rebuild kit. This is one of the best upgrades you can make to restore lost power or gain serious performance — and it's 100% bolt-on with no machining required.

📦 Kit Includes:

Brand New 89mm Cylinder – Ready to install, no core required
Custom 89mm Piston Kit – Select your preferred brand at checkout (Wiseco, CP, or JE)
Cometic Top End Gasket Set – Includes head, base, and exhaust gaskets for a perfect seal

🔧 Key Features:

Fits all Honda TRX 400EX & 400X models (1999–2015)
Works with stock or modified heads and cranks
Compatible with pump or race gas
Backed by original manufacturer warranties
Easy installation — no case machining required

📦 Shipping Time:
This engine kit typically ships within 5–7 business days. Tracking info will be sent once shipped.

💬 Customer Support:
We’re available Monday through Friday, 7 AM to 4 PM PST, and our store chat is open 24/7 for fast help any time.

We ship next day most of the time. Modquad parts are shipped Monday-Thursday. Engine Kits are 3-5 business days.

We don't do backorder! If your items has already sold you will be notified immediately and you money refunded on the spot.

Sold items are removed daily.

If you see it on this website, it is 100% in stock unless it just sold before you clicked buy.

If you call we answer, if you text we respond, if you have a question we respond. Sometimes we sleep so it could be next morning but we will respond.

Thank you for shopping with us! We appreciate you!

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