The Cometic C7855 Top End Gasket Kit is designed for Yamaha YZ250 two-stroke motorcycles from 2002 through 2011. This kit helps restore reliable sealing throughout the top end while supporting consistent engine performance during maintenance, repair, or rebuild work. It is engineered to fit the specified Yamaha YZ250 applications and is a practical replacement for worn or damaged original-equipment gaskets.
Cometic uses application-specific materials to provide dependable sealing, flexibility, and torque retention. The graphite gaskets feature a steel core laminated on both sides with flexible graphite, helping accommodate sealing surfaces and maintain reliable compression. Fiber gaskets are designed for maximum seal performance, flexibility, and torque retention, while the O-ring gaskets meet or exceed OEM specifications for dependable service.
Installing the Cometic C7855 kit can help raise compression for improved low-end power when used with the appropriate engine configuration and installation procedures. Verify cylinder, piston, and engine specifications before installation, and follow Yamaha service-manual torque specifications and recommended assembly practices. This kit is intended for the following fitment: 2002 Yamaha YZ250, 2003 Yamaha YZ250, 2004 Yamaha YZ250, 2005 Yamaha YZ250, 2006 Yamaha YZ250, 2007 Yamaha YZ250, 2008 Yamaha YZ250, 2009 Yamaha YZ250, 2010 Yamaha YZ250, and 2011 Yamaha YZ250.
Brand: Cometic
Manufacturer Part Number: C7855
Vendor Part Number: C7855
Application: Yamaha YZ250
Size: Top end gasket kit
Features:
- Compression Support: Raises compression for improved low-end power when properly matched to the engine configuration.
- Graphite Construction: Steel-core graphite gaskets are laminated on both sides with flexible graphite for dependable sealing.
- Fiber Gaskets: Designed for maximum seal performance, flexibility, and torque retention.
- O-Ring Sealing: O-ring gaskets meet or exceed OEM specifications.
- Fitment: Fits 2002–2011 Yamaha YZ250 motorcycles.
Fitment:
2002 Yamaha YZ250
2003 Yamaha YZ250
2004 Yamaha YZ250
2005 Yamaha YZ250
2006 Yamaha YZ250
2007 Yamaha YZ250
2008 Yamaha YZ250
2009 Yamaha YZ250
2010 Yamaha YZ250
2011 Yamaha YZ250
2012 Yamaha YZ250
2013 Yamaha YZ250
2014 Yamaha YZ250
2015 Yamaha YZ250
2016 Yamaha YZ250
2016 Yamaha YZ250X
2017 Yamaha YZ250
2017 Yamaha YZ250X
2018 Yamaha YZ250
2018 Yamaha YZ250X
2019 Yamaha YZ250
2019 Yamaha YZ250X
2020 Yamaha YZ250
2020 Yamaha YZ250X
2021 Yamaha YZ250
2021 Yamaha YZ250X
2022 Yamaha YZ250
2022 Yamaha YZ250X
2023 Yamaha YZ250
2023 Yamaha YZ250X