ATHENA Valve Stem Seals for HONDA NX 125, XR 600 1988-1998

The ATHENA P400210420650 set of valve stem seals is designed for HONDA NX 125, XR 600 from 1988 to 1998. 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: P400210420650
• EAN code: 8051764542284
• Weight: 50 g

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 650 L
• Valve shims : see the selection
• Valve cover gasket : ATHENA S410210017001 · ATHENA S410210015070

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:
HONDA NX 125 1995
HONDA NX 125 1994
HONDA NX 125 1993
HONDA NX 125 1992
HONDA NX 125 1991
HONDA NX 125 1990
HONDA NX 125 1989
HONDA NX 125 1988
HONDA XR 600 1998
HONDA XR 600 1997
HONDA XR 600 1996
HONDA XR 600 1995
HONDA XR 600 1994
HONDA XR 600 1993
HONDA XR 600 1992
HONDA XR 600 1991
HONDA XR 600 1990
HONDA XR 600 1989
HONDA XR 600 1988