ATHENA Fork Oil Seal Kit 40x52x10/10.5 mm for APRILIA, HUSQVARNA, KTM and CAGIVA 1983-2012

The ATHENA 40x52x10/10.5 mm P40FORK455050 fork oil seal kit is designed for APRILIA PEGASO 650, RX 125, TUAREG 125, TUAREG 250, TUAREG 350, KTM GS 125, GS 250, GS 350, GS 500, CAGIVA WMX 125, WMX 250 and HUSQVARNA WRE 125 from 1983 to 2012. Fitted at the top of the fork leg, under the dust seal, the oil seal keeps the fork sealed. A leak lowers the oil level, the damping changes and oil can run onto the brake disc.

Specifications

• Brand: ATHENA
• Manufacturer part number: P40FORK455050
• EAN code: 8055681307735
• Weight: 50 g

When to replace it?

• Film of oil on the inner tube after a few fork strokes.
• Oil traces on the fork leg, the caliper or the brake disc.
• Fork that becomes softer on one side.

Before replacing a leaking seal, clean under its lip: a trapped grain of sand is sometimes enough to cause the leak. If it still leaks, replace the seals on both legs. Measure your seal (inside diameter, outside diameter and height) or check the original part number: the size is in the name.

Fitting tips

1. Drain and disassemble the fork leg following the manual, then remove the dust seal, the circlip and the old seal.
2. Check the fork bushings and the condition of the inner tube: a scratch or a rust spot will cut a new seal.
3. Protect the end of the tube (plastic bag), oil the lip and drive the seal in straight with a seal driver of the right diameter.
4. Refit the circlip and a new dust seal, then reset the fork oil level.

Why ATHENA?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• Fork dust seals : ATHENA P40FORK455179 · ATHENA P40FORK455189
• Fork oil : LIQUI MOLY 10W 500 ml
• Fork bushings : SHOWA

Frequently asked questions

Do I have to change both seals?
Yes: they have the same age and the same mileage. Replace both oil seals and, ideally, both dust seals.

Why is my new seal leaking?
Most often because of a scratched or pitted tube, a lip turned back during installation, or worn bushings that let the tube develop play.

Compatibility

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

Fits:
APRILIA PEGASO 650 1998
APRILIA PEGASO 650 1997
APRILIA PEGASO 650 1996
APRILIA PEGASO 650 1995
APRILIA PEGASO 650 1994
APRILIA PEGASO 650 1993
APRILIA PEGASO 650 1992
APRILIA RX 125 1992
APRILIA RX 125 1989
APRILIA RX 125 1988
APRILIA RX 125 1987
APRILIA RX 125 1986
APRILIA RX 125 1985
APRILIA TUAREG 125 1992
APRILIA TUAREG 125 1991
APRILIA TUAREG 125 1990
APRILIA TUAREG 125 1989
APRILIA TUAREG 125 1988
APRILIA TUAREG 125 1987
APRILIA TUAREG 125 1986
APRILIA TUAREG 125 1985
APRILIA TUAREG 250 1984
APRILIA TUAREG 350 1987
APRILIA TUAREG 350 1986
CAGIVA WMX 125 1984
CAGIVA WMX 125 1983
CAGIVA WMX 250 1984
HUSQVARNA WRE 125 2012
HUSQVARNA WRE 125 2011
HUSQVARNA WRE 125 2010
HUSQVARNA WRE 125 2009
HUSQVARNA WRE 125 2008
HUSQVARNA WRE 125 2007
HUSQVARNA WRE 125 2006
HUSQVARNA WRE 125 2005
HUSQVARNA WRE 125 2004
HUSQVARNA WRE 125 2003
HUSQVARNA WRE 125 2002
HUSQVARNA WRE 125 2001
HUSQVARNA WRE 125 2000
KTM GS 125 1984
KTM GS 250 1985
KTM GS 250 1984
KTM GS 250 1983
KTM GS 350 1983
KTM GS 500 1983