JE Forged 12:1 Piston Cylinder Rebuild Kit Honda TRX400EX XR400R 85mm Stock Bore
Restore Honda TRX400X and XR400R performance with JE forged piston technology, stock bore cylinder, and premium gasket sealing. Honda TRX400X XR400R JE Piston Cylinder Rebuild Kit
Honda TRX400EX TRX400X XR400R 12:1 JE Piston Cylinder Top End Rebuild Kit
๐ Product Description
Restore and upgrade the performance of your Honda sport ATV or XR dirt bike with this premium BPRATV Complete Top End Rebuild Kit featuring a 12:1 High Compression JE Forged Racing Piston, new 85mm stock bore cylinder, and a Cometic MLS top end gasket kit. Designed specifically for the legendary Honda TRX400EX, TRX400X, and XR400R platforms, this complete package delivers increased compression, stronger throttle response, improved torque, and dependable durability for aggressive trail riding, racing, and dune performance.
The included JE forged piston is engineered for high-performance applications and provides superior strength compared to cast pistons while maintaining excellent reliability. Combined with the precision-machined BPRATV aftermarket cylinder and premium Cometic MLS head gasket, this kit offers excellent sealing and long-lasting performance for both pump gas and race gas applications.
๐ฅ Key Features & Benefits
This complete Honda 400 top end rebuild kit is engineered for riders looking to restore engine reliability while adding aggressive high-compression performance. Every component is brand new and designed for direct compatibility with OEM Honda engine components.
- 12:1 high compression JE forged piston delivers improved power and throttle response
- 85mm stock bore cylinder provides direct OEM-style replacement fitment
- Cometic MLS head gasket offers superior combustion sealing durability
- Forged piston construction handles high heat and aggressive riding conditions
- Compatible with OEM components for simplified installation
- Works with pump gas or race gas depending on tuning and setup
- Ideal for trail, dune, race, and performance rebuilds
๐ฆ Product Contents
- NEW BPRATV 85mm stock bore aftermarket cylinder
- 12:1 high compression 85mm JE forged piston
- Piston ring set
- Wrist pin
- Piston circlips
- Cometic complete top end gasket kit
- MLS multi-layer steel head gasket
โ Compatibility
This complete top end rebuild kit is compatible with Honda air-cooled 397cc four-stroke engines used in multiple ATV and off-road motorcycle platforms.
- Honda TRX400EX โ 1999-2008
- Honda TRX400X โ 2009-2014
- Honda XR400R โ 1996-2004
- Compatible with OEM cylinder head and engine components
- Designed for 85mm stock bore engine configurations
โ FAQ
- Q: Is this a stock bore rebuild kit?
A: Yes. This kit uses an 85mm stock bore cylinder and piston configuration designed as a direct replacement for OEM specifications.
- Q: Does this kit include everything needed for a top end rebuild?
A: Yes. The kit includes the cylinder, JE forged piston, rings, wrist pin, circlips, and a complete Cometic top end gasket kit with MLS head gasket.
- Q: Can this piston run on pump gas?
A: Yes. The 12:1 JE piston can run on pump gas or race gas depending on engine tuning, fuel quality, and riding conditions.
- Q: Is the piston forged or cast?
A: This kit includes a genuine JE forged racing piston designed for high-performance durability and increased strength.
- Q: Are all components brand new?
A: Yes. Every component included in this kit is brand new in original packaging and covered by the manufacturer's warranty where applicable.
๐ Why Buy from BPRATV
At BPRATV, our promise is unwavering: The Best Parts. The Best Performance. The Best Price. We specialize in high-performance powersports components trusted by riders and builders who demand reliability and results. Every part is carefully selected for precision, durability, and real-world performance. Trust BPRATV to keep your Honda TRX400EX, TRX400X, and XR400R running at its best, every single time.
Upgrade your Honda 400 engine with JE forged high-compression performance โ order your complete rebuild kit today!
BPRATV - The Best Parts. The Best Performance. The Best Price.
BRAPPPPPPPPPP!
ยฉ 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. ยง1051 as provided by 40 C.F.R. ยง1051.620, 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.
