ATHENA Cylinder Head Gasket for KTM EXCF, SXF, XCF 250, HUSQVARNA FC, FE 250 and GAS GAS ECF, EXF, MCF 250 2023-2025

The ATHENA S410270001057 head gasket is designed for KTM EXCF 250, SXF 250, XCF 250, GAS GAS ECF 250, EXF 250, MCF 250 and HUSQVARNA FC 250, FE 250 from 2023 to 2025. Between the cylinder head and the cylinder, the head gasket contains the pressure of every explosion. Once tightened, it takes the shape of the parts: on reassembly you need a new gasket to keep full compression.

Specifications

• Brand: ATHENA
• Manufacturer part number: S410270001057
• EAN code: 8051757122301
• Weight: 50 g
• Engine: 4-stroke

When to replace it?

• Loss of compression, less lively engine.
• Black marks or hissing at the head/cylinder joint.
• Coolant level dropping, bubbles in the radiator.

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, centred on the studs and the coolant holes.
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. Refill the coolant and take the opportunity to replace the spark plug.

Why ATHENA?

Founded in 1973 near Vicenza, Athena is an Italian engine gasket specialist that has made its gaskets on its own production lines since day one, as well as a renowned manufacturer of pistons and cylinder kits. The brand supplies original equipment to manufacturers such as KTM, Ducati, Fantic, Piaggio and Triumph, and is a partner of the MXGP motocross world championship.

Spare parts and items to plan

• Top-end gasket kit : MOOSE · VERTEX
• Piston : VERTEX · PROX
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : NGK 3521 · NGK 97225

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:
GAS GAS ECF 250 2024
GAS GAS EXF 250 2024
GAS GAS MCF 250 2024
HUSQVARNA FC 250 2025
HUSQVARNA FC 250 2024
HUSQVARNA FC 250 2023
HUSQVARNA FE 250 2025
HUSQVARNA FE 250 2024
KTM EXCF 250 2024
KTM SXF 250 2025
KTM SXF 250 2024
KTM SXF 250 2023
KTM XCF 250 2025
KTM XCF 250 2024
KTM XCF 250 2023