Honda TRX 400EX 400X 416 87mm Wiseco Big Bore Cylinder Piston Cometic Gasket Set
4628M08700, C7826, 4606M08700, M2001, 133889, Upgrade your Honda 400EX, 400X, or XR400R with this Wiseco 87mm 416cc Big Bore Piston & Cometic Gasket Kit. Boosts power, durability, and reliability. Fits all years.
Honda 400EX 400X XR400 Wiseco 87mm 416 Big Bore Cylinder Piston Gasket Kit
⚡ Upgrade Your 400EX, 400X, or XR400R to 416cc Power ⚡
This complete Wiseco 87mm 416cc Big Bore Kit includes a forged 11:1 compression piston and a premium Cometic top end gasket kit. Built to deliver more horsepower, torque, and durability, it is the ultimate upgrade for riders looking to push their Honda engine beyond stock performance levels.
🔧 Kit Features & Benefits 🔧
Everything you need to refresh and upgrade your top end is included, backed by American-made quality from Wiseco and Cometic.
- 87mm 11:1 Wiseco Forged Piston Kit (piston, rings, wrist pin, circlips)
- Cometic Top End Gasket Kit with big bore MLS head gasket
- MLS Head Gasket thickness: .027"
- Improves power delivery, throttle response, and reliability
- Made in the USA by Wiseco & Cometic
✅ Fitment Compatibility ✅
Designed to fit all Honda 400EX, 400X, and XR400R models and years. Direct bolt-on upgrade for stock or modified builds.
- Honda TRX400EX Sportrax (1999-2008)
- Honda TRX400X (2009, 2012-2014)
- Honda XR400R (1996-2004)
- Replaces OEM Part Numbers: 12251-MBV-013, 12251-MBV-003, 12251-KCY-671, 12251-HN1-A41, 12251-HN1-003, 12191-KCY-673, 12191-KCY-672, 12191-KCY-671, 12191-HN1-A71, 13103-KCY-670, 13102-KCY-670, 13101-KCY-670, and more
- Wiseco Part #: 4628M08700 | Cometic Part #: C7826
❓ Frequently Asked Questions (FAQ) ❓
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Q: Does this kit require machining?
A: No, it is a direct bolt-on kit designed for the stock cylinder with a 87mm bore size.
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Q: What compression ratio does this piston offer?
A: This Wiseco piston delivers an 11:1 compression ratio for stronger performance while maintaining reliability.
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Q: Will this work with pump gas?
A: Yes, 11:1 compression is safe for use with premium pump gas when tuned correctly.
🌟 Why Buy from BPRATV? Trusted Performance Experts 🌟
At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. We stock only the highest quality performance parts, proven to give your machine more power and durability. Trust BPRATV to deliver exactly what you need, every single time.
🔥 Upgrade your 400EX, 400X, or XR400R today with this complete Wiseco 416 Big Bore Piston & Gasket Kit – upgrade now and ride stronger! 🔥
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© BPRATV 1-year limited warranty from the manufacturer for material or workmanship defects.* 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 [e.g., vehicle code§§ 27156 and 38391]. This product is sold only for use in connection with EPA -certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing and not used for any recreational purpose or on public highways or right of ways maintained by and open to the public. This product is sold only in connection with machines that do not fall under state and/or federal noise or emission standards/regulations. Purchasers who/that purchase this product represent and warrant that the product is purchased only in connection with EPA -certified, emission-regulations-exempt and noise-regulations-exempt competition/racing vehicles as interpreted under applicable state and/or federal law.
