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Crankcase Gasket and Oil Seal Kit for Yamaha YZ450F WR450R YFZ450R
Crankcase Gasket and Oil Seal Kit for Yamaha YZ450F WR450R YFZ450R
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Product Overview
Engineered for the high-revving demands of the Yamaha 450cc platform, this premium crankcase gasket and oil seal kit provides a military-grade seal for your engine. Built to withstand the punishing vibrations of motocross and desert racing, this kit uses advanced fiber-reinforced materials to stop oil leaks and prevent dirt ingestion, ensuring your engine maintains peak compression and lubrication.
Product Compatibility
Important: This kit is designed for the high-performance 450 series. Does NOT fit WR450F models.
| Vehicle Type | Model | Year Range | Engine Type |
| Motocross | Yamaha YZ450F | 2003–Current | 449cc Liquid-Cooled |
| Sport ATV | Yamaha YFZ450R | 2009–Current | 449cc Fuel-Injected |
| Off-Road | Yamaha WR450R | (Verify Year) | 449cc Single Cylinder |
| Sport ATV | Yamaha YFZ450X | 2010–2011 | 449cc Single Cylinder |
Specifications
| Feature | Details |
| Gasket Material | Graphite-Embedded High-Temp Fiber |
| Oil Seal Material | Fiber-Reinforced Nitrile Rubber (NBR) |
| Primary OEM Ref | 11395-MEB-670 (Cross-Compatible Type) |
| Environment | Extreme Off-Road / Racing Conditions |
| Package Includes | Crankcase Gasket & Primary Oil Seal Set |
Key Features
- Graphite-Embedded Technology: The gaskets feature embedded graphite for superior heat dissipation and a non-stick surface, making future removals cleaner and easier.
- Fiber-Reinforced Seals: High-strength rubber seals are reinforced with internal fibers to resist tearing and wear caused by constant off-road vibrations and high RPMs.
- Vibration Dampening: Specifically designed for the Yamaha 450 platform to absorb engine harmonics, preventing gasket "creeping" and ensuring a permanent seal.
- Extreme Chemical Resistance: Resistant to high-detergent synthetic oils and racing fuels, preventing seal swelling or degradation over time.
- Precision Die-Cut Alignment: Laser-cut for a 100% accurate fit with Yamaha engine cases, ensuring all oil galleries and bolt holes align perfectly without modification.
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Fitment FAQ
Will this part fit my specific model and year?
This gasket set is intended for Important: This kit is designed for the high-performance 450 series. Does NOT fit WR450F models.; Vehicle Type; Engine Type; Motocross; Yamaha YZ450F; 2003–Current; 449cc Liquid-Cooled. It is best matched to original part number(s) 11395-MEB-670. Key physical/spec details from the product data include 450cc, 449cc. Use the compatibility table and product photos together before ordering.
Do I need to match the OEM part number?
Yes. Match your original part number to 11395-MEB-670 before purchase. For this gasket set, also compare the OEM number, gasket shape, hole pattern, engine model, bore size, and material thickness. This is especially important for Yamaha YZ450F/WR450R/YFZ450R/WR450F models because similar model names can use different parts by year or trim.
What models or situations does this part not fit?
Do not order this gasket set for machines outside the listed compatibility, or for units with different bolt-hole layouts, water/oil passages, bore sizes, or engine castings. If your original part number does not cross-reference with 11395-MEB-670, treat the fitment as unconfirmed. Model years outside 2010–2011, 2003, 2009, 2010, 2011 should be verified separately. Do not rely only on the model name or engine size.
What should I check before ordering?
Before ordering, compare your original part with the photos and check the OEM number, gasket shape, hole pattern, engine model, bore size, and material thickness. Confirm OEM/cross-reference number(s): 11395-MEB-670. Recheck listed specs such as 450cc, 449cc. If any connector, mounting point, size, or year detail is different, confirm fitment before installation.