ATHENA Valve Stem Seals for HONDA ATC, CRF, NX, XRV, YAMAHA WRF, YZF 450 and FANTIC XEF, XXF 450 1981-2026

ATHENA offers these valve stem seals for HONDA ATC, CRF, NX, XRV, YAMAHA WRF, YZF 450 and FANTIC XEF, XXF 450 1981-2026. Each valve slides in a guide. At the top of the guide, a small seal (the valve stem seal) lets through just enough oil to lubricate but stops it running into the combustion chamber.

Why replace the valve stem seals?

The benefits:

• To be replaced every time the valves are removed.
• Cure oil consumption and blue smoke on start-up.
• An inexpensive part that protects valves and guides.

Why choose ATHENA?

Athena, founded in 1973 by Giovanni Mancassola near Vicenza and based in Alonte (Italy), designs gaskets, pistons and cylinder kits; it supplies original equipment to manufacturers such as KTM, Ducati, Fantic and Triumph.

When should you replace this part?

Blue smoke on start-up after standing overnight is the typical sign of hardened seals. They are also replaced at every head rebuild, even if they look fine.

Specifications and fitting tips

• Manufacturer part number: P400210420105

Spare parts and items to plan

• Valves : PROX · KIBBLEWHITE
• Valve shims : PROX 29.948 · PROX 29.948
• Valve cover gasket : ATHENA · MOOSE

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
FANTIC XEF 450 2025
FANTIC XEF 450 2024
FANTIC XEF 450 2023
FANTIC XEF 450 2022
FANTIC XXF 450 2026
FANTIC XXF 450 2025
FANTIC XXF 450 2024
FANTIC XXF 450 2023
FANTIC XXF 450 2022
HONDA ATC 185 1993
HONDA ATC 185 1992
HONDA ATC 185 1991
HONDA ATC 185 1990
HONDA ATC 185 1989
HONDA ATC 185 1988
HONDA ATC 185 1987
HONDA ATC 185 1986
HONDA ATC 185 1985
HONDA ATC 185 1984
HONDA ATC 185 1983
HONDA ATC 185 1982
HONDA ATC 185 1981
HONDA CRF 80 2013
HONDA CRF 80 2012
HONDA CRF 80 2011
HONDA CRF 80 2010
HONDA CRF 80 2009
HONDA CRF 80 2008
HONDA CRF 80 2007
HONDA CRF 80 2006
HONDA CRF 80 2005
HONDA CRF 80 2004
HONDA CRF 100 2012
HONDA CRF 100 2011
HONDA CRF 100 2010
HONDA CRF 100 2009
HONDA CRF 100 2008
HONDA CRF 100 2007
HONDA CRF 100 2006
HONDA CRF 100 2005
HONDA CRF 150 2005
HONDA CRF 150 2004
HONDA CRF 230 2016
HONDA CRF 230 2012
HONDA CRF 230 2010
HONDA CRF 230 2009
HONDA CRF 230 2008
HONDA CRF 230 2007
HONDA CRF 230 2006
HONDA CRF 230 2005
HONDA CRF 230 2004
HONDA CRF 230 2003
HONDA CRF 450 2008
HONDA CRF 450 2007
HONDA CRF 450 2006
HONDA CRF 450 2005
HONDA CRF 450 2004
HONDA CRF 450 2003
HONDA CRF 450 2002
HONDA NX 125 1988
HONDA XRV 650 1989
HONDA XRV 650 1988
HONDA XRV 750 2003
HONDA XRV 750 2002
HONDA XRV 750 2001
HONDA XRV 750 2000
HONDA XRV 750 1999
HONDA XRV 750 1998
HONDA XRV 750 1997
HONDA XRV 750 1996
HONDA XRV 750 1995
HONDA XRV 750 1994
HONDA XRV 750 1993
HONDA XRV 750 1992
HONDA XRV 750 1991
HONDA XRV 750 1990
YAMAHA WRF 450 2026
YAMAHA WRF 450 2025
YAMAHA WRF 450 2024
YAMAHA WRF 450 2023
YAMAHA WRF 450 2022
YAMAHA WRF 450 2021
YAMAHA WRF 450 2020
YAMAHA WRF 450 2019
YAMAHA WRF 450 2018
YAMAHA WRF 450 2017
YAMAHA WRF 450 2016
YAMAHA YZF 450 2026
YAMAHA YZF 450 2025
YAMAHA YZF 450 2024
YAMAHA YZF 450 2023
YAMAHA YZF 450 2022
YAMAHA YZF 450 2021
YAMAHA YZF 450 2020
YAMAHA YZF 450 2019
YAMAHA YZF 450 2018
YAMAHA YZF 450 2017
YAMAHA YZF 450 2016
YAMAHA YZF 450 2015
YAMAHA YZF 450 2014
YAMAHA YZF 450 2013
YAMAHA YZF 450 2012
YAMAHA YZF 450 2011
YAMAHA YZF 450 2010