Upgrade your Yamaha Kodiak 400 with this aftermarket top-end gasket kit, engineered for a precise rebuild of the YFM400A and YFM400FA platforms spanning 2000 through 2006. This kit supplies all the essential gaskets and seals necessary for a thorough top-end rebuild, helping restore compression, eliminate leaks, and maintain reliable cooling and oil control during operation. Built to endure the heat and stress of high-mileage engines, the kit emphasises a clean, accurate fit and durable sealing surfaces for lasting performance.

Comprehensive Vehicle Fitment

Product Specifications

OEM & Aftermarket Cross-Reference Information

OEM and aftermarket cross-reference numbers are provided for reference purposes only. These part numbers are commonly referenced for Yamaha top-end gasket sets and may appear across multiple aftermarket suppliers. Always verify fitment using your machine's exact model, year, and original part number before ordering.

What's Included

Based on standard top-end gasket kits for the YFM400 Kodiak engine, this kit typically includes:

• Cylinder head gasket

• Cylinder base gasket

• Intake gaskets

• Exhaust gasket(s)

• Timing chain tensioner gasket

• Valve stem seals

• Assorted O-rings and seals as required for complete top-end sealing 

Why Choose This Aftermarket Top End Gasket Kit?

• Direct-Fit Compatibility: Precision-engineered for Yamaha YFM400A Kodiak 2x4 and YFM400FA Kodiak 4x4 Ultramatic models spanning 2000 through 2006, including Hunter and Special Editions .

• OEM Cross-Reference: Cross-references genuine Yamaha part numbers 5GH-11351-00-00 and 5GH-11181-00-00 for confident replacement.

• Proven Aftermarket Support: Multiple respected aftermarket brands manufacture compatible gasket kits:

  • Moose Offroad offers top-end gasket sets made in the USA with high-tech materials for unmatched reliability and a long-lasting seal .

  • Cometic features Extreme Sealing Technology (EST) with embossed stainless steel gaskets and rubber coating that meets and exceeds OEM specifications .

  • Athena provides precision-engineered gasket kits confirmed for YFM400 Kodiak applications .

• Complete Top-End Coverage: Includes all essential gaskets for cylinder head, base, intake, exhaust, timing cover, and valve stem seals.

• Restores Compression: New head and base gaskets ensure proper cylinder sealing for optimal engine performance.

• Prevents Leaks: Complete sealing kit prevents oil seepage and maintains clean engine operation.

• Cost-Effective: Aftermarket replacement provides OEM-equivalent quality at a practical price point, as confirmed by multiple independent suppliers.

Installation Notes:

• Ensure all mating surfaces are clean and free from old gasket material before installation.

• Follow manufacturer torque specifications and tightening sequences for cylinder head bolts.

• Use new gaskets only—do not reuse old gaskets once removed.

• Check valve clearance after head installation and adjust if necessary.

• Verify all components are properly seated before reassembling the top end.

• After installation, run the engine and check for any signs of leaks.

Why Upgrade?
Worn or damaged gaskets can cause compression loss, oil leaks, and contamination—leading to poor performance and potential engine damage. Restore your Yamaha YFM400 Kodiak engine's sealing integrity with this quality aftermarket top end gasket set, designed to keep you riding with confidence.

Order your top end gasket kit today and get back on the trail with confidence.