TRX400EX TRX 400EX Big Bore Kit 87mm Cylinder Stage 2 Hotcam Top End Rebuild Kit

Honda TRX400EX 87mm Big Bore 416cc Kit Stage 2 Hot Cam Top End Rebuild

📖 Product Description

The Honda TRX400EX 87mm Big Bore 416cc Top End Rebuild Kit from BPRATV is the ultimate power upgrade for riders who demand serious performance. Featuring a forged 87mm piston, Stage 2 Hot Cams camshaft, premium bearings, and a complete big bore gasket system, this kit transforms your TRX400EX into a torque-hungry 416cc beast. Built for pump or race gas, this setup delivers aggressive throttle response, stronger midrange pull, and proven durability.

📦 Complete 87mm 416cc Kit Includes

Every premium component needed for a reliable and powerful big bore conversion.

• BPRATV 87mm Aftermarket Big Bore Cylinder (1-Year Warranty)
• Stage 2 Hot Cams Camshaft
• SKF OEM Upgrade Camshaft Bearings (Both)
• 87mm Forged Piston Kit by Wiseco, Wossner, CP Carrillo, or JE Pistons* (Rings, Pin & Clips)
• Cometic Big Bore Top End Gasket Kit with MLS Head Gasket
• Viton Valve Stem Seals
• BPRATV Heavy Duty Cam Chain
• BPRATV Talon Titanium Cylinder Head Stud Kit
• NGK Spark Plug

🔥 Key Features & Benefits

Designed to deliver maximum horsepower, improved torque, and long-term reliability at the best price in the industry.

• Increases displacement to 416cc with 87mm big bore cylinder
• Stage 2 Hot Cams camshaft for stronger midrange and top-end power
• Forged piston compatible with pump or race gas
• Titanium head studs for superior clamping force
• Complete bolt-on kit compatible with OEM components

✅ Compatibility

Direct fit for the following Honda ATV and dirt bike models:

• Honda TRX400EX (1999-2014)
• Honda TRX400X (1999-2014)
• Honda XR400 (1996-2004)
• Honda XR400R (1996-2004)
• Compatible with all OEM components

❓ Frequently Asked Questions (FAQ)

• Q: What displacement does this kit create?

  A: This 87mm big bore setup increases your engine to approximately 416cc.

• Q: Can I run pump gas?

  A: Yes. The forged piston is designed for pump gas or race gas applications.

• Q: Is this a complete bolt-on kit?

  A: Yes. This kit is compatible with all OEM components and includes everything needed for installation.

• Q: Does it include a warranty?

  A: Yes. The cylinder includes a 1-year warranty and original manufacturer warranties apply to branded components.

🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟

At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. No one sells more Honda TRX400EX big bore kits than we do — in every major size — with the best parts in the industry, at unbeatable pricing, and lightning-fast shipping. Trust BPRATV to keep your Honda TRX400EX, TRX400X, or XR400 running at its absolute best, every single time.

Upgrade to 416cc power today and feel the difference instantly!

BPRATV - The Best Parts. The Best Performance. The Best Price.

BRAPPPPPPPPPP!

© BPRATV LLC

Due to the nature of high performance and racing applications, BPRATV LLC components are sold without express warranty or any implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not, under any circumstances, be liable for any specific, incidental or consequential damages, including, but not limited to, damage, or loss of property or equipment, loss of profits or revenue(s), cost of purchased or replacement goods, or claims of customers of the purpose, which may arise and/or shall result from sale, installation or use of these parts. Installation of these parts may void vehicle manufacturers warranty coverage and/or may cause the vehicle to be illegal in some locations.

This product is exempt from the emission standards and related requirements of 40 C.F.R. §1051 as provided by 40 C.F.R. §1051.620, and California law. This product is sold only for use in connection with EPA-certified, purpose-built, nonroad vehicles used solely for closed-course, nonroad competition/racing.