Yamaha YFZ450R 98mm 99mm Big Bore Cometic Top End Gasket Kit + Viton Seals

Product Overview

Built for power and reliability, this Cometic 98mm/99mm Big Bore Top End Gasket Kit is designed to support high-performance upgrades on Yamaha 450cc engines. Combined with Kibblewhite Precisions Legendary Red Viton valve stem seals, this complete top end solution ensures long-lasting sealing under high-compression, high-RPM builds.

Whats Included

• Cometic MLS Cylinder Head Gasket 98mm bore, 0.027″ thick, multi-layer steel design
• Base Gasket OEM match for fit and performance
• Tensioner Gasket
• Exhaust Gasket
• Kibblewhite Red Viton Valve Stem Seals (Qty 5) High-temperature, high-performance seals

Model Fitment

Yamaha YFZ450R & YFZ450X (Fuel Injected) 2009 to 2025
Yamaha WR450F 20072009, 20112015
Yamaha YZ450F 20062009

OEM Replacement

Replaces OEM Part Numbers:
2S2-11181-00-00, 2S2-11351-00-00, 4FM-12213-00-00,
3VD-14613-01-00, 33M-12119-00-00, 4SV-12119-00-00

Advantage What It Means for You Cometic MLS Technology Superior seal at high compression and temperature 98mm/99mm Big Bore Compatibility Perfect fit for upgraded high-performance cylinders Kibblewhite Red Viton Seals Prevents oil leakage and resists extreme heat no blue seal knockoffs OEM Replacement Direct replacement for multiple Yamaha part numbers Made in USA Reliable construction from trusted brands

FAQs

• Can I use this on stock bore? No, this kit is for 98mm and 99mm big bore upgrades only.
• Are the valve seals genuine Kibblewhite? Yes, you receive authentic Kibblewhite RED Viton seals.
• Is this kit complete? Yes, includes all necessary gaskets and seals for a complete top end rebuild.

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Power up your YFZ450R or WR/YZ450F with this top-tier gasket + seal combo kit!

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