ATHENA Valve Stem Seals for HONDA CRF 50, CRF 70, CRF 110, CRF 125, CRF 250, CRF 450 2004-2023

The ATHENA M739012209GB4 set of valve stem seals is designed for HONDA CRF 50, CRF 70, CRF 110, CRF 125, CRF 250, CRF 450 from 2004 to 2023. Valve stem seals sit on top of the valve guides. They let through just enough oil to lubricate the stem and stop the rest from running down into the combustion chamber, where it would burn.

Specifications

• Brand: ATHENA
• Manufacturer part number: M739012209GB4
• EAN code: 8051757028825
• Engine: 4-stroke

When to replace it?

• Blue smoke on start-up or after a long downhill on a closed throttle.
• Oil consumption and a fouled spark plug.
• Seals hardened or split during a cylinder head rebuild.

Every time the valves are removed: valve replacement, seat recutting or cylinder head rebuild.

Fitting tips

1. Identify the intake and exhaust seals if they are different.
2. Protect the seal lip as you slide it over the valve stem (sleeve supplied, or adhesive tape over the collet grooves).
3. Oil the lip and press the seal on straight with a suitable tool, without crushing it.
4. Refit the springs and collets, then set the valve clearance with suitable shims.

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

• Valves : WOSSNER · PROX
• Valve shims : PROX 29.948 · PROX 29.748
• Valve cover gasket : CENTAURO · ATHENA

Frequently asked questions

Should the valves be replaced at the same time?
Check them: if the seat face is marked or the stem is worn, replace the valves and have the seats recut.

Compatibility

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

Fits:
HONDA CRF 50 2023
HONDA CRF 50 2022
HONDA CRF 50 2021
HONDA CRF 50 2020
HONDA CRF 50 2019
HONDA CRF 50 2018
HONDA CRF 50 2017
HONDA CRF 50 2016
HONDA CRF 50 2015
HONDA CRF 50 2014
HONDA CRF 50 2013
HONDA CRF 50 2012
HONDA CRF 50 2011
HONDA CRF 50 2010
HONDA CRF 50 2009
HONDA CRF 50 2008
HONDA CRF 50 2007
HONDA CRF 50 2006
HONDA CRF 50 2005
HONDA CRF 50 2004
HONDA CRF 70 2012
HONDA CRF 70 2011
HONDA CRF 70 2010
HONDA CRF 70 2009
HONDA CRF 70 2008
HONDA CRF 70 2007
HONDA CRF 70 2006
HONDA CRF 70 2005
HONDA CRF 70 2004
HONDA CRF 110 2023
HONDA CRF 110 2022
HONDA CRF 110 2021
HONDA CRF 110 2020
HONDA CRF 110 2019
HONDA CRF 110 2018
HONDA CRF 110 2017
HONDA CRF 110 2016
HONDA CRF 110 2015
HONDA CRF 110 2014
HONDA CRF 110 2013
HONDA CRF 125 2023
HONDA CRF 125 2022
HONDA CRF 125 2021
HONDA CRF 125 2020
HONDA CRF 125 2019
HONDA CRF 125 2018
HONDA CRF 125 2017
HONDA CRF 125 2016
HONDA CRF 125 2015
HONDA CRF 125 2014
HONDA CRF 250 2023
HONDA CRF 250 2022
HONDA CRF 450 2023
HONDA CRF 450 2022
HONDA CRF 450 2021
HONDA CRF 450 2020
HONDA CRF 450 2019
HONDA CRF 450 2018
HONDA CRF 450 2017
HONDA CRF 450 2016
HONDA CRF 450 2015
HONDA CRF 450 2014
HONDA CRF 450 2013
HONDA CRF 450 2012
HONDA CRF 450 2011
HONDA CRF 450 2010
HONDA CRF 450 2009