ATHENA Oil Seal 20x40x9 mm for TM RACING EN 125, EN 144, MX 125, MX 144 and KAWASAKI KX 125 1988-2018

The ATHENA 20x40x9 mm M730901135002 oil seal is designed for TM RACING EN 125, EN 144, MX 125, MX 144 and KAWASAKI KX 125 from 1988 to 2018. An oil seal (lip seal) seals the gap between a spinning shaft and the casing it passes through: its lip, held against the shaft by a small spring, keeps the oil in and stops water and dirt getting in. It is identified by three dimensions in millimetres: inner diameter (the shaft), outer diameter (the housing) and thickness.

Specifications

• Brand: ATHENA
• Manufacturer part number: M730901135002
• EAN code: 8051757222988
• Rubber-covered outer case
• Profile: FPJ
• Weight: 10 g
• Engine: 2-stroke

When to replace it?

• Oil weeping or leaking around the shaft.
• Lip hardened, cracked or turned over when you take the seal out.
• A groove worn into the shaft where the lip runs: the new seal must sit on a clean, undamaged surface.
• On a two-stroke, a crankshaft seal that lets air in makes the idle unstable and leans out the mixture.

Replace an oil seal as soon as it leaks, and always whenever you remove it: once a lip has come out of its housing, it never seals properly again. Note the three dimensions marked on the old seal (for example 20 x 32 x 7) or measure the shaft, the housing and the thickness with a caliper.

Fitting tips

1. Drive out the old seal with a seal puller or a screwdriver with a protected tip, without scratching the housing or the shaft.
2. Clean the housing and check the shaft: a scratch or groove under the lip will make the new seal leak.
3. Lightly oil the lip or smear it with grease, then drive the seal in perfectly square with a socket that presses on its outer edge, lip (spring side) facing the oil.
4. Protect the lip from splines, threads or keys as the shaft goes through (adhesive tape or a thin sleeve).

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

• Grease : MOTUL 400 g

Frequently asked questions

How do I read an oil seal size?
In this order: inner diameter, outer diameter, thickness, in millimetres. A 20 x 32 x 7 seal fits a 20 mm shaft in a 32 mm housing and is 7 mm thick.

NBR or FKM (Viton)?
NBR (nitrile rubber) suits most uses. FKM handles heat better: it's the right choice near the crankshaft or the water pump. The material is listed in the specifications when it is known.

Why would a new seal leak?
Most of the time the shaft is marked under the lip, the seal went in crooked, or the lip folded over as the shaft went through.

Compatibility

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

Fits:
KAWASAKI KX 125 2008
KAWASAKI KX 125 2007
KAWASAKI KX 125 2006
KAWASAKI KX 125 2005
KAWASAKI KX 125 2004
KAWASAKI KX 125 2003
KAWASAKI KX 125 2002
KAWASAKI KX 125 2001
KAWASAKI KX 125 2000
KAWASAKI KX 125 1999
KAWASAKI KX 125 1998
KAWASAKI KX 125 1997
KAWASAKI KX 125 1996
KAWASAKI KX 125 1995
KAWASAKI KX 125 1994
KAWASAKI KX 125 1993
KAWASAKI KX 125 1992
KAWASAKI KX 125 1991
KAWASAKI KX 125 1990
KAWASAKI KX 125 1989
KAWASAKI KX 125 1988
TM RACING EN 125 2014
TM RACING EN 125 2013
TM RACING EN 125 2012
TM RACING EN 125 2011
TM RACING EN 125 2010
TM RACING EN 125 2009
TM RACING EN 125 2008
TM RACING EN 125 2007
TM RACING EN 125 2006
TM RACING EN 125 2005
TM RACING EN 125 2004
TM RACING EN 125 2003
TM RACING EN 125 2002
TM RACING EN 125 2001
TM RACING EN 144 2018
TM RACING EN 144 2017
TM RACING EN 144 2016
TM RACING EN 144 2015
TM RACING EN 144 2014
TM RACING EN 144 2013
TM RACING EN 144 2012
TM RACING EN 144 2011
TM RACING EN 144 2010
TM RACING EN 144 2009
TM RACING EN 144 2008
TM RACING MX 125 2014
TM RACING MX 125 2013
TM RACING MX 125 2012
TM RACING MX 125 2011
TM RACING MX 125 2010
TM RACING MX 125 2009
TM RACING MX 125 2008
TM RACING MX 125 2007
TM RACING MX 125 2006
TM RACING MX 125 2005
TM RACING MX 125 2004
TM RACING MX 125 2003
TM RACING MX 125 2002
TM RACING MX 125 2001
TM RACING MX 144 2018
TM RACING MX 144 2017
TM RACING MX 144 2016
TM RACING MX 144 2015
TM RACING MX 144 2014
TM RACING MX 144 2013
TM RACING MX 144 2012
TM RACING MX 144 2011
TM RACING MX 144 2010
TM RACING MX 144 2009
TM RACING MX 144 2008