ATHENA Timing Chain for BETA RR 250, RR 350, RR 390, RR 430, RR 480 and TM RACING ENF 450 2005-2024

The ATHENA S41400020 timing chain is designed for BETA RR 250, RR 350, RR 390, RR 430, RR 480 and TM RACING ENF 450 from 2005 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: S41400020
• EAN code: 8057018269884
• Weight: 260 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

• Valve cover gasket : ATHENA
• Valve shims : PROX 29.100 · PROX 29.VSA1000
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50

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:
BETA RR 250 2012
BETA RR 250 2011
BETA RR 250 2010
BETA RR 250 2009
BETA RR 250 2008
BETA RR 250 2007
BETA RR 250 2006
BETA RR 250 2005
BETA RR 350 2016
BETA RR 350 2015
BETA RR 350 2014
BETA RR 350 2013
BETA RR 350 2012
BETA RR 350 2011
BETA RR 390 2024
BETA RR 390 2023
BETA RR 390 2022
BETA RR 390 2021
BETA RR 390 2020
BETA RR 390 2019
BETA RR 390 2018
BETA RR 430 2016
BETA RR 430 2015
BETA RR 430 2014
BETA RR 480 2019
BETA RR 480 2018
TM RACING ENF 450 2010
TM RACING ENF 450 2009
TM RACING ENF 450 2008
TM RACING ENF 450 2007
TM RACING ENF 450 2006