The Cometic C3766 80mm Top End Gasket Kit is designed for Yamaha four-stroke off-road motorcycles requiring dependable top-end sealing and increased compression. This kit is engineered to fit select 2019–2023 Yamaha YZ250F models, 2020–2021 Yamaha WR250F models, and 2020–2022 Yamaha YZ250FX models. Its 80mm size supports a precise fit for compatible engine applications while helping restore reliable performance during top-end service.
Built by Cometic, the kit combines application-specific gasket materials with construction intended to support long-term sealing performance. The graphite gaskets feature a steel core laminated on both sides with flexible graphite, providing strength and conformity across mating surfaces. Fiber gaskets are designed for maximum seal, flexibility, and torque retention, while the included O-ring gaskets meet or exceed OEM specifications for dependable sealing at critical engine interfaces.
Using the Cometic manufacturer part number C3766 and vendor part number 68-37660E, this top end gasket kit is a practical choice for engine rebuilding, maintenance, and performance-focused service. Verify the motorcycle model, year, bore size, and engine configuration before installation to ensure proper fitment. The kit is compatible with 2019–2023 Yamaha YZ250F, 2020–2021 Yamaha WR250F, and 2020–2022 Yamaha YZ250FX applications listed below.
Features:
- 80mm top end gasket kit for select Yamaha four-stroke motorcycle engines
- Raises compression for improved low-end power
- Graphite gaskets feature a steel core laminated on both sides with flexible graphite
- Fiber gaskets are designed for maximum sealing, flexibility, and torque retention
- O-ring gaskets meet or exceed OEM specifications
- Fits 2019–2023 Yamaha YZ250F
- Fits 2020–2021 Yamaha WR250F
- Fits 2020–2022 Yamaha YZ250FX
- Brand: Cometic
- Manufacturer part number: C3766
- Vendor part number: 68-37660E
Fitment:
2019 Yamaha YZ250F
2020 Yamaha WR250F
2020 Yamaha YZ250F
2020 Yamaha YZ250FX
2021 Yamaha WR250F
2021 Yamaha YZ250F
2021 Yamaha YZ250FX
2022 Yamaha WR250F
2022 Yamaha YZ250F
2022 Yamaha YZ250FX
2023 Yamaha WR250F
2023 Yamaha YZ250F
2023 Yamaha YZ250FX