ATHENA titanium Exhaust Valve for YAMAHA WRF 450, YZF 450 and FANTIC XEF 450, XXF 450 2020-2023

The ATHENA titane VE-485206T exhaust valve is designed for YAMAHA WRF 450, YZF 450 and FANTIC XEF 450, XXF 450 from 2020 to 2023. The exhaust valve opens to let out the very hot burnt gases. It is the valve most exposed to heat: as it and its seat wear, the valve clearance closes up and the valve eventually stops closing.

Specifications

• Brand: ATHENA
• Manufacturer part number: VE-485206T
• EAN code: 8053300710539
• Engine: 4-stroke

When to replace it?

• Valve clearance closing up from one check to the next.
• Hard hot starting, loss of compression.
• Marked valve face or cupped valve when removed.

As soon as the valve clearance no longer holds between two checks. Always replace the valves on the same side together and have the seats recut.

Fitting tips

1. Have the valve seats recut and check the guides.
2. Don't lap a coated titanium valve with grinding paste: it would destroy the coating.
3. Fit new valve stem seals and check the springs.
4. Set the valve clearance with valve shims if needed, then check it again after the first few hours.
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 stem seals : ATHENA · KIBBLEWHITE
• Valve shims : PROX 29.948 · PROX 29.948
• Valve cover gasket : MOOSE 817944MSE · MOOSE 817854MSE

Frequently asked questions

Do both valves need replacing?
Yes, exhaust valves are usually replaced as a pair, with the seats recut.

Titanium or steel?
Titanium is much lighter: the valve train copes better with high revs. Steel is more tolerant of wear and is perfectly suited to leisure riding; don't mix the two materials without following the manufacturer's recommendations (springs).

Compatibility

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

Fits:
FANTIC XEF 450 2023
FANTIC XEF 450 2022
FANTIC XXF 450 2022
YAMAHA WRF 450 2023
YAMAHA WRF 450 2022
YAMAHA WRF 450 2021
YAMAHA YZF 450 2023
YAMAHA YZF 450 2022
YAMAHA YZF 450 2021
YAMAHA YZF 450 2020