ATHENA Valve Stem Seals for YAMAHA WRF 250, WRF 400, YZF 250 1998-2015

The ATHENA M73904SV12119 set of valve stem seals is designed for YAMAHA WRF 250, WRF 400, YZF 250 from 1998 to 2015. Valve stem seals sit on top of the valve guides. They let through just enough oil to lubricate the stem and stop the rest from running down into the combustion chamber, where it would burn.

Specifications

• Brand: ATHENA
• Manufacturer part number: M73904SV12119
• Engine: 4-stroke

When to replace it?

• Blue smoke on start-up or after a long downhill on a closed throttle.
• Oil consumption and a fouled spark plug.
• Seals hardened or split during a cylinder head rebuild.

Every time the valves are removed: valve replacement, seat recutting or cylinder head rebuild.

Fitting tips

1. Identify the intake and exhaust seals if they are different.
2. Protect the seal lip as you slide it over the valve stem (sleeve supplied, or adhesive tape over the collet grooves).
3. Oil the lip and press the seal on straight with a suitable tool, without crushing it.
4. Refit the springs and collets, then set the valve clearance with suitable shims.

Why ATHENA?

Athena, an Italian company founded in 1973 near Vicenza, designs gaskets, pistons and cylinder kits for motorcycles. An OEM supplier to KTM, Ducati, Fantic, Piaggio and Triumph and a partner of the MXGP world championship, it develops its parts on the test bench and on the track with racing teams.

Spare parts and items to plan

• Valves : VERTEX 8400005-2 · VERTEX 8400005-3
• Valve shims : HOT CAMS HCSHIM01 · HOT CAMS 5PK748
• Valve cover gasket : MOOSE 817852MSE · MOOSE 819030MSE

Frequently asked questions

Should the valves be replaced at the same time?
Check them: if the seat face is marked or the stem is worn, replace the valves and have the seats recut.

Compatibility

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

Fits:
YAMAHA WRF 250 2015
YAMAHA WRF 250 2014
YAMAHA WRF 250 2013
YAMAHA WRF 250 2012
YAMAHA WRF 250 2011
YAMAHA WRF 250 2009
YAMAHA WRF 250 2008
YAMAHA WRF 250 2007
YAMAHA WRF 250 2006
YAMAHA WRF 250 2005
YAMAHA WRF 250 2004
YAMAHA WRF 250 2003
YAMAHA WRF 400 2000
YAMAHA WRF 400 1999
YAMAHA WRF 400 1998
YAMAHA YZF 250 2013
YAMAHA YZF 250 2010
YAMAHA YZF 250 2009
YAMAHA YZF 250 2007
YAMAHA YZF 250 2006
YAMAHA YZF 250 2005
YAMAHA YZF 250 2004
YAMAHA YZF 250 2003
YAMAHA YZF 250 2002
YAMAHA YZF 250 2001