ATHENA Timing Chain for YAMAHA WR 250, WRF 450, YZF 450 and GAS GAS ECF 250 2003-2024

The ATHENA S41400013 timing chain is designed for YAMAHA WR 250, WRF 450, YZF 450 and GAS GAS ECF 250 from 2003 to 2024. The timing chain drives the camshafts from the crankshaft and keeps the valves in sync with the piston. As it stretches, it throws the valve timing out and pushes the tensioner to the end of its travel.

Specifications

• Brand: ATHENA
• Manufacturer part number: S41400013
• EAN code: 8057018265855
• Weight: 230 g
• Engine: 4-stroke

When to replace it?

• Rattling or chain noise on the timing side, especially at idle.
• Tensioner at the end of its travel.
• Timing marks that no longer line up.

At the intervals in the service manual, and as soon as the tensioner reaches the end of its travel. Check the sprockets and the guides at the same time.

Fitting tips

1. Set the engine at top dead centre on the compression stroke, marks aligned, before removing anything.
2. On most motocross engines the chain is endless, with no master link: replacing it means removing the crankshaft sprocket or a camshaft, as described in the manual.
3. Line the camshafts up with their timing marks again, then put the tensioner back under tension.
4. Turn the engine over two full turns by hand and check the timing again before starting.
5. Refit with a valve cover gasket in good condition.

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

• Cam chain tensioner : GE.CO 200.040.004 · GE.CO 200.040.002
• Valve cover gasket : MOOSE 819200MSE · MOOSE 817944MSE
• Valve shims : PROX 29.948 · PROX 29.948
• 4-stroke engine oil : MOTUL 10W50 · LIQUI MOLY 10W40 1 L

Frequently asked questions

Should I replace the tensioner?
Check it: a worn tensioner, or one at the end of its travel, must be replaced along with the chain.

Compatibility

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

Fits:
GAS GAS ECF 250 2019
GAS GAS ECF 250 2018
GAS GAS ECF 250 2017
GAS GAS ECF 250 2016
GAS GAS ECF 250 2015
GAS GAS ECF 250 2014
GAS GAS ECF 250 2013
YAMAHA WR 250 2020
YAMAHA WR 250 2019
YAMAHA WR 250 2018
YAMAHA WR 250 2017
YAMAHA WR 250 2016
YAMAHA WR 250 2015
YAMAHA WR 250 2014
YAMAHA WR 250 2013
YAMAHA WR 250 2012
YAMAHA WR 250 2011
YAMAHA WR 250 2010
YAMAHA WR 250 2009
YAMAHA WR 250 2008
YAMAHA WRF 450 2015
YAMAHA WRF 450 2014
YAMAHA WRF 450 2013
YAMAHA WRF 450 2012
YAMAHA WRF 450 2011
YAMAHA WRF 450 2010
YAMAHA WRF 450 2009
YAMAHA WRF 450 2008
YAMAHA WRF 450 2007
YAMAHA WRF 450 2006
YAMAHA WRF 450 2005
YAMAHA WRF 450 2004
YAMAHA WRF 450 2003
YAMAHA YZF 450 2024
YAMAHA YZF 450 2023
YAMAHA YZF 450 2022
YAMAHA YZF 450 2021
YAMAHA YZF 450 2020
YAMAHA YZF 450 2009
YAMAHA YZF 450 2008
YAMAHA YZF 450 2007
YAMAHA YZF 450 2006
YAMAHA YZF 450 2005
YAMAHA YZF 450 2004
YAMAHA YZF 450 2003