ATHENA Fork Oil Seal Kit 41x53x10.5 mm for YAMAHA, APRILIA, HONDA and KAWASAKI 1981-1992

The ATHENA 41x53x10.5 mm P40FORK455053 fork oil seal kit is designed for HONDA CR 250, CR 450, KAWASAKI KX 125, KX 250, APRILIA RX 125, TUAREG 125 and YAMAHA DT 125 from 1981 to 1992. The fork oil seal keeps the oil inside the fork leg while letting the inner tube slide. It is a wear item: dust, mud and impacts on the tubes eventually damage its lip, and the fork leaks.

Specifications

• Brand: ATHENA
• Manufacturer part number: P40FORK455053
• EAN code: 8055681307667
• Weight: 60 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?

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

• Fork dust seals : ATHENA P40FORK455098 · ATHENA P40FORK455096
• Fork oil : LIQUI MOLY 10W 500 ml
• Fork bushings : ATHENA S41TI46K · ATHENA S41TE46K

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 RX 125 1991
APRILIA RX 125 1990
APRILIA TUAREG 125 1990
HONDA CR 250 1981
HONDA CR 450 1981
KAWASAKI KX 125 1982
KAWASAKI KX 250 1982
YAMAHA DT 125 1992
YAMAHA DT 125 1991
YAMAHA DT 125 1990
YAMAHA DT 125 1989