BEST Honda TRX 400EX 400X Top End Rebuild Kit Stock Cylinder Piston Camshaft SKF

BEST Honda TRX 400EX 400X Top End Rebuild Kit Stock Cylinder Piston Camshaft SKF

4606M08500, C7825, 1051-3, 12100-KCY-670, 71016-4,4667M08900, 1043-2, C7826, 1051-3, 12100-KCY-670, 71016-4, 13111-KCY-670, 4606M08500, C7826, 71016-4, 13111-KCY-670, 12251-HN1-003, 12209-KL4-005, 12191-KCY-673, 13011-KCY-670, 90601-KA5-000, 13103-KCY-670, C7825, 808894, 4040, 4606M08700, C7826, H0402027S, 808829, M2001, 8604D200, 8604D400,OE Part Numbers 1 12100-HN1-A70, 12191-KCY-672 OE Part Numbers 2 13011-KCY-670, 13101-KCY-670 OE Part Numbers 3 13111-KCY-670, 90601-KA5-000 OE Part Numbers 4 98061-59616, 12251-HN1-003 OE Part Numbers 5 12391-KCY-671, 12100-KCY-670

Honda TRX 400EX/400X Stock Bore 85mm Performance Rebuild Kit w/ Hi-Performance Camshaft – Fits All Honda 400EX & XR400R Models

Give your Honda 400EX, 400X, or XR400R into a high-performance boost with our TRX 400EX/400X Stock Bore Top End Engine Rebuild Kit. This all-in-one top-end upgrade provides everything you need to unlock all the power, reliability, and performance. With quality components that won't break the bank, this kit is designed to fit all Honda 400EX, 400X, and XR400R models and years.

Key Features:

  • Aftermarket 85mm Stock Bore Cylinder & 10:1 Compression Piston Kit for enhanced horsepower and torque.
  • Complete Piston Assembly including rings, wristpin, and circlips for a perfect fit and optimal performance.
  • Top End Gasket Kit featuring a MLS head gasket to ensure a leak-proof seal.
  • High-Performance Camshaft to maximize your engine’s power output.
  • SKF OEM-Grade Upgraded Cam Bearings for durability and smoother operation.
  • Heavy-Duty BPRATV Timing Cam Chain – thicker and stronger than OEM/aftermarket chains for long-lasting reliability.
  • New Spark Plug included to ensure a quick and efficient startup after the rebuild.

Whether you're upgrading for off-road dominance or seeking a reliable rebuild, this kit delivers outstanding performance and longevity. Boost your Honda’s power, throttle response, and durability!

✔ Fits All Honda 400EX, 400X, and XR400R Models – Any Year!
✔ Perfect for avid racers, trail riders, and those seeking a high-performance upgrade!

This kit allows you to rebuild your top end without breaking the bank, making it an excellent choice for budget-conscious performance enthusiasts. For those aiming for premium upgrades featuring forged pistons or Hot Cams camshafts, be sure to explore our premium kits.

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NOTICE REGARDING PHOTOS: Product photos used in our listings are for example only to show the high quality of our components. You will receive the correct quantity, size, and fitment of bearings, titanium fasteners, nuts, and bolts for the specific kit listed.

BEARING NOTICE: In some cases, you may receive SEALED bearings. If your application requires an OPEN bearing, the seals can easily be removed.

EMISSIONS & RACE USE ONLY: This product is exempt from emission standards and 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]. Sold ONLY for use with EPA-certified, purpose-built, nonroad vehicles used solely for closed course, nonroad competition/racing. Installation may void vehicle manufacturers' warranty and/or may be illegal in some locations.

WARRANTY & LIABILITY: © BPRATV LLC 1-year limited warranty from manufacturer for material/workmanship defects.* Due to the nature of high performance and racing, components are sold without express/implied warranty of merchantability or fitness for a specific purpose. BPRATV LLC shall not be liable for specific, incidental, or consequential damages (loss of property, equipment, profits, or revenue) resulting from sale, installation, or use of these parts. This product is NOT DIY; we strongly recommend work be done by a qualified, experienced mechanic.

RETURNS: Returns accepted within 30 days for items 100% complete, brand new, and in original packaging. Items installed or prepped (lubricated/sealed) are ineligible. For warranty consideration, parts MUST be sent back for physical inspection. No exceptions. We do not warranty based on photos, emails, or third-party assessments.

SPECIALTY WARRANTIES: Cub Cylinders: Lifetime warranty for original owner via BPRATV/Millennium Technologies inspection; covers cylinder only. Titanium Fasteners: Failure during use results in replacement only. Neither warranty covers improper tuning, installation, maintenance, or misuse.

INTERCHANGEABLE PARTS: We may substitute parts of equal quality from different manufacturers to prevent backorder delays. Prices and listings subject to change without notice.

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