SKF Fork Oil Seal 43x55.1x9 mm for YAMAHA, KAWASAKI, SUZUKI, BETA and HONDA 1981-2026

The SKF 43x55.1x9 mm OSB-43K fork oil seal is designed for YAMAHA IT 200, IT 250, IT 490, TT 600, TTR 250, WR 250, WR 500, XT 660, YZ 125, YZ 250, YZ 465, YZ 490, KAWASAKI KDX 200, KLX 250, KLX 300, KLX 650, KX 125, KX 250, KX 500, SUZUKI DL 1000, RM 125, RM 250, RM 465, RM 500, HONDA CR 125, CR 250, CR 500 and BETA XTRAINER 250, XTRAINER 300 from 1981 to 2026. 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: SKF
• Manufacturer part number: OSB-43K
• EAN code: 8050040143689
• Weight: 30 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 SKF?

SKF is renowned for its fork seals, among the most durable in motocross according to the American magazine Motocross Action, which notes that the WP forks on KTMs are fitted with them as original equipment. In its Dual Compound range, the brand combines two rubber compounds moulded together: a tough green dust wiper and a softer red sealing lip, both reinforced by a metal insert.

Spare parts and items to plan

• Fork dust seals : ATHENA P40FORK455098 · ATHENA P40FORK455131
• Fork oil : LIQUI MOLY 10W 500 ml
• Fork bushings : INNTECK · ATHENA

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:
BETA XTRAINER 250 2025
BETA XTRAINER 250 2024
BETA XTRAINER 250 2023
BETA XTRAINER 250 2022
BETA XTRAINER 250 2021
BETA XTRAINER 250 2020
BETA XTRAINER 250 2019
BETA XTRAINER 250 2018
BETA XTRAINER 250 2017
BETA XTRAINER 300 2025
BETA XTRAINER 300 2024
BETA XTRAINER 300 2023
BETA XTRAINER 300 2022
BETA XTRAINER 300 2021
BETA XTRAINER 300 2020
BETA XTRAINER 300 2019
BETA XTRAINER 300 2018
BETA XTRAINER 300 2017
BETA XTRAINER 300 2016
BETA XTRAINER 300 2015
HONDA CR 125 1996
HONDA CR 125 1995
HONDA CR 125 1994
HONDA CR 250 1995
HONDA CR 500 1995
KAWASAKI KDX 200 2005
KAWASAKI KDX 200 2004
KAWASAKI KDX 200 2003
KAWASAKI KDX 200 2002
KAWASAKI KDX 200 2001
KAWASAKI KDX 200 2000
KAWASAKI KDX 200 1999
KAWASAKI KDX 200 1998
KAWASAKI KDX 200 1997
KAWASAKI KDX 200 1996
KAWASAKI KDX 200 1995
KAWASAKI KLX 250 2016
KAWASAKI KLX 250 2015
KAWASAKI KLX 250 2014
KAWASAKI KLX 250 2013
KAWASAKI KLX 250 2012
KAWASAKI KLX 250 2011
KAWASAKI KLX 250 2010
KAWASAKI KLX 250 2009
KAWASAKI KLX 250 2008
KAWASAKI KLX 250 2007
KAWASAKI KLX 250 2006
KAWASAKI KLX 250 2005
KAWASAKI KLX 250 2004
KAWASAKI KLX 250 2003
KAWASAKI KLX 250 2002
KAWASAKI KLX 250 2001
KAWASAKI KLX 250 2000
KAWASAKI KLX 250 1999
KAWASAKI KLX 250 1998
KAWASAKI KLX 250 1997
KAWASAKI KLX 250 1996
KAWASAKI KLX 250 1995
KAWASAKI KLX 250 1994
KAWASAKI KLX 250 1993
KAWASAKI KLX 300 2026
KAWASAKI KLX 300 2025
KAWASAKI KLX 300 2024
KAWASAKI KLX 300 2023
KAWASAKI KLX 300 2022
KAWASAKI KLX 300 2021
KAWASAKI KLX 300 2020
KAWASAKI KLX 650 1996
KAWASAKI KLX 650 1995
KAWASAKI KLX 650 1994
KAWASAKI KLX 650 1993
KAWASAKI KX 125 1995
KAWASAKI KX 125 1994
KAWASAKI KX 125 1993
KAWASAKI KX 125 1992
KAWASAKI KX 125 1991
KAWASAKI KX 250 1995
KAWASAKI KX 250 1994
KAWASAKI KX 250 1993
KAWASAKI KX 250 1992
KAWASAKI KX 250 1991
KAWASAKI KX 500 1996
KAWASAKI KX 500 1995
KAWASAKI KX 500 1994
KAWASAKI KX 500 1993
KAWASAKI KX 500 1992
KAWASAKI KX 500 1991
SUZUKI DL 1000 2025
SUZUKI DL 1000 2024
SUZUKI DL 1000 2023
SUZUKI DL 1000 2022
SUZUKI DL 1000 2021
SUZUKI DL 1000 2020
SUZUKI DL 1000 2019
SUZUKI DL 1000 2018
SUZUKI DL 1000 2017
SUZUKI DL 1000 2016
SUZUKI DL 1000 2015
SUZUKI DL 1000 2014
SUZUKI RM 125 1988
SUZUKI RM 125 1987
SUZUKI RM 125 1986
SUZUKI RM 125 1985
SUZUKI RM 125 1984
SUZUKI RM 250 1988
SUZUKI RM 250 1987
SUZUKI RM 250 1986
SUZUKI RM 250 1985
SUZUKI RM 250 1984
SUZUKI RM 250 1983
SUZUKI RM 465 1982
SUZUKI RM 465 1981
SUZUKI RM 500 1984
SUZUKI RM 500 1983
YAMAHA IT 200 1986
YAMAHA IT 200 1985
YAMAHA IT 200 1984
YAMAHA IT 250 1983
YAMAHA IT 490 1984
YAMAHA IT 490 1983
YAMAHA TT 600 1986
YAMAHA TT 600 1985
YAMAHA TT 600 1984
YAMAHA TT 600 1983
YAMAHA TTR 250 2006
YAMAHA TTR 250 2005
YAMAHA TTR 250 2004
YAMAHA TTR 250 2003
YAMAHA TTR 250 2002
YAMAHA TTR 250 2001
YAMAHA TTR 250 2000
YAMAHA TTR 250 1999
YAMAHA WR 250 1997
YAMAHA WR 250 1996
YAMAHA WR 250 1995
YAMAHA WR 250 1994
YAMAHA WR 250 1993
YAMAHA WR 250 1992
YAMAHA WR 250 1991
YAMAHA WR 500 1993
YAMAHA WR 500 1992
YAMAHA XT 660 2009
YAMAHA XT 660 2008
YAMAHA YZ 125 1995
YAMAHA YZ 125 1994
YAMAHA YZ 125 1993
YAMAHA YZ 125 1992
YAMAHA YZ 125 1991
YAMAHA YZ 125 1990
YAMAHA YZ 125 1989
YAMAHA YZ 125 1988
YAMAHA YZ 125 1987
YAMAHA YZ 125 1986
YAMAHA YZ 125 1985
YAMAHA YZ 250 1995
YAMAHA YZ 250 1994
YAMAHA YZ 250 1993
YAMAHA YZ 250 1992
YAMAHA YZ 250 1991
YAMAHA YZ 250 1990
YAMAHA YZ 250 1989
YAMAHA YZ 250 1988
YAMAHA YZ 250 1987
YAMAHA YZ 250 1986
YAMAHA YZ 250 1985
YAMAHA YZ 250 1984
YAMAHA YZ 250 1983
YAMAHA YZ 250 1982
YAMAHA YZ 250 1981
YAMAHA YZ 465 1981
YAMAHA YZ 490 1990
YAMAHA YZ 490 1989
YAMAHA YZ 490 1988
YAMAHA YZ 490 1987
YAMAHA YZ 490 1986
YAMAHA YZ 490 1985
YAMAHA YZ 490 1984
YAMAHA YZ 490 1983
YAMAHA YZ 490 1982