ATHENA Timing Chain for YAMAHA XT 660 and KAWASAKI KXF 450 2004-2023

The ATHENA S41400024 timing chain is designed for YAMAHA XT 660 and KAWASAKI KXF 450 from 2004 to 2023. 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: S41400024
• EAN code: 8050038444354

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 : see the selection
• Valve cover gasket : MOOSE · ATHENA
• Valve shims : PROX 29.948 · PROX 29.VSA948
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063

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:
KAWASAKI KXF 450 2023
KAWASAKI KXF 450 2022
KAWASAKI KXF 450 2021
KAWASAKI KXF 450 2020
KAWASAKI KXF 450 2019
YAMAHA XT 660 2012
YAMAHA XT 660 2011
YAMAHA XT 660 2010
YAMAHA XT 660 2009
YAMAHA XT 660 2008
YAMAHA XT 660 2007
YAMAHA XT 660 2006
YAMAHA XT 660 2005
YAMAHA XT 660 2004