ATHENA Fork Oil Seal Kit 36x48x11/12.5 mm for YAMAHA DT 125, TT 225, TT 230, XT 225 1985-2015

The ATHENA 36x48x11/12.5 mm P40FORK455037 fork oil seal kit is designed for YAMAHA DT 125, TT 225, TT 230, XT 225 from 1985 to 2015. 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: P40FORK455037
• EAN code: 8055681307988
• 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
• Fork oil : LIQUI MOLY 10W 500 ml
• Fork bushings : see the selection

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:
YAMAHA DT 125 1987
YAMAHA DT 125 1986
YAMAHA DT 125 1985
YAMAHA TT 225 1987
YAMAHA TT 225 1986
YAMAHA TT 230 2015
YAMAHA TT 230 2014
YAMAHA TT 230 2013
YAMAHA TT 230 2012
YAMAHA TT 230 2011
YAMAHA TT 230 2010
YAMAHA TT 230 2009
YAMAHA TT 230 2008
YAMAHA TT 230 2007
YAMAHA TT 230 2006
YAMAHA TT 230 2005
YAMAHA XT 225 1996
YAMAHA XT 225 1995
YAMAHA XT 225 1994
YAMAHA XT 225 1993
YAMAHA XT 225 1992