ATHENA titanium Intake Valve for YAMAHA WRF 250, YZF 250 and FANTIC XEF 250, XEF 310, XXF 250 2019-2027

The ATHENA titane VI-485208T intake valve is designed for FANTIC XEF 250, XEF 310, XXF 250 and YAMAHA WRF 250, YZF 250 from 2019 to 2027. The intake valve lets the air-fuel mixture into the chamber, then closes to hold the compression. As a valve wears and sinks into its seat, the valve clearance disappears: the engine starts badly, loses power and the valve eventually stops closing.

Specifications

• Brand: ATHENA
• Manufacturer part number: VI-485208T
• EAN code: 8050038444286
• Weight: 40 g
• 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 · PROX
• Valve shims : HOT CAMS HCSHIM01 · HOT CAMS 5PK748
• Valve cover gasket : MOOSE 817852MSE · MOOSE 819030MSE

Frequently asked questions

Do both valves need replacing?
Yes, intake valves are usually replaced as a pair to keep the engine running evenly.

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 250 2026
FANTIC XEF 250 2025
FANTIC XEF 250 2024
FANTIC XEF 250 2023
FANTIC XEF 250 2022
FANTIC XEF 250 2021
FANTIC XEF 310 2026
FANTIC XEF 310 2025
FANTIC XEF 310 2024
FANTIC XEF 310 2023
FANTIC XXF 250 2026
FANTIC XXF 250 2025
FANTIC XXF 250 2024
FANTIC XXF 250 2023
FANTIC XXF 250 2022
YAMAHA WRF 250 2026
YAMAHA WRF 250 2025
YAMAHA WRF 250 2024
YAMAHA WRF 250 2023
YAMAHA WRF 250 2022
YAMAHA WRF 250 2021
YAMAHA WRF 250 2020
YAMAHA YZF 250 2027
YAMAHA YZF 250 2026
YAMAHA YZF 250 2025
YAMAHA YZF 250 2024
YAMAHA YZF 250 2023
YAMAHA YZF 250 2022
YAMAHA YZF 250 2021
YAMAHA YZF 250 2020
YAMAHA YZF 250 2019