The Cometic C3786 Top End Gasket Kit is designed for Yamaha 450F engines requiring a 97mm top-end gasket solution. This kit helps restore sealing performance during cylinder, piston, or top-end service while supporting reliable engine operation and consistent compression. It is engineered for select Yamaha motocross and off-road applications and is suitable for professional repairs, engine rebuilds, and performance maintenance.
Cometic uses application-focused gasket materials to provide dependable sealing across critical engine surfaces. The graphite gaskets feature a steel core laminated on both sides with flexible graphite, helping accommodate surface irregularities while maintaining sealing integrity. Fiber gaskets are designed for maximum seal, flexibility, and torque retention, while the included O-ring gaskets meet or exceed OEM specifications.
Fitment includes 2020–2022 Yamaha YZ450F, 2021–2023 Yamaha YZ450FX, and 2021–2022 Yamaha WR450F models. Confirm the exact year and model of your motorcycle before installation to ensure proper application. This Cometic kit is identified by manufacturer part number C3786 and vendor part number 68-37860E.
Features:
- 97mm top-end gasket kit for select Yamaha 450F 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 2020–2022 Yamaha YZ450F
- Fits 2021–2023 Yamaha YZ450FX
- Fits 2021–2022 Yamaha WR450F
- Brand: Cometic
- Manufacturer part number: C3786
- Vendor part number: 68-37860E
Fitment:
2020 Yamaha YZ450F
2021 Yamaha WR450F
2021 Yamaha YZ450F
2021 Yamaha YZ450FX
2022 Yamaha WR450F
2022 Yamaha YZ450F
2022 Yamaha YZ450FX
2023 Yamaha WR450F
2023 Yamaha YZ450FX