The Cometic C3057 Top End Gasket Kit is designed for Yamaha YZ250F models from 2001 through 2010. This replacement gasket set helps restore a reliable seal throughout the top end while supporting proper engine compression and dependable performance. It is a practical choice for engine rebuilding, top-end service, or replacing worn and damaged original-equipment gaskets.
Cometic manufactures the C3057 kit with application-specific materials selected for sealing performance, flexibility, and torque retention. The graphite gaskets use a steel core laminated on both sides with flexible graphite, helping them conform to mating surfaces while maintaining a durable seal. Fiber gaskets are engineered for maximum sealing ability, flexibility, and resistance to loosening under normal engine operating conditions. The included O-ring gaskets meet or exceed OEM specifications for dependable fit and sealing.
Installation of this top end gasket kit can help raise compression and improve low-end power when used with the appropriate engine components and installation procedures. Always inspect cylinder, head, and crankcase mating surfaces before assembly, and follow the Yamaha service manual for torque specifications and installation requirements. The kit is intended for the listed Yamaha YZ250F applications and should be verified against the motorcycle’s year and model before purchase.
Fitment: 2001-2010 Yamaha YZ250F
Brand: Cometic
Manufacturer Part Number: C3057
Vendor Part Number: C3057
Features:
- Compression Increase: Designed to raise compression for improved low-end power.
- Graphite Gaskets: Steel-core construction laminated on both sides with flexible graphite for reliable sealing.
- Fiber Gaskets: Engineered for maximum seal, flexibility, and torque retention.
- O-Ring Gaskets: Manufactured to meet or exceed OEM specifications.
- Application-Specific Fit: Fits 2001-2010 Yamaha YZ250F motorcycles.
Fitment:
2001 Yamaha YZ250F
2002 Yamaha YZ250F
2003 Yamaha YZ250F
2004 Yamaha YZ250F
2005 Yamaha YZ250F
2006 Yamaha YZ250F
2007 Yamaha YZ250F
2008 Yamaha YZ250F
2009 Yamaha YZ250F
2010 Yamaha YZ250F
2011 Yamaha YZ250F
2012 Yamaha YZ250F
2013 Yamaha YZ250F