ATHENA Cylinder Head Gasket for YAMAHA TT 250, XT 250 1990

The ATHENA S410485001098 head gasket is designed for YAMAHA TT 250, XT 250 1990. The head gasket seals between the cylinder head and the cylinder: it holds in the combustion pressure and, depending on the engine, the coolant. Crushed when tightened, it can never be reused.

Specifications

• Brand: ATHENA
• Manufacturer part number: S410485001098
• EAN code: 8051757181957
• Thickness: OE
• Weight: 90 g

When to replace it?

• Loss of compression, less lively engine.
• Black marks or hissing at the head/cylinder joint.

Every time the cylinder head is removed, and therefore at every piston change.

Fitting tips

1. Clean the cylinder head and cylinder faces without scratching them.
2. Fit the gasket dry, the right way round and centred on the studs.
3. No sealant on the gasket.
4. Tighten the cylinder head in a criss-cross pattern, in several stages, to the manufacturer's torque.
5. Take the opportunity to replace the spark plug.

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

• Top-end gasket kit : ATHENA P400485600252 · ATHENA S410485006025
• Piston : see the selection
• Spark plug : NGK 4055 · NGK 2412

Frequently asked questions

Is the gasket enough to refit the cylinder head?
It replaces the head gasket only. If you also remove the cylinder, go for a complete top end gasket kit instead.

Compatibility

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

Fits:
YAMAHA TT 250 1990
YAMAHA XT 250 1990