ATHENA Cylinder Head Gasket for KTM EGS 125, EXC 125, GS 125, MX 125, SX 125 1987-1997

The ATHENA S410270001007 head gasket is designed for KTM EGS 125, EXC 125, GS 125, MX 125, SX 125 from 1987 to 1997. 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: S410270001007
• EAN code: 8051757091829
• Weight: 50 g
• Engine: 2-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?

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 · CENTAURO
• Piston : VERTEX 24419A · VERTEX 24243A
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• Spark plug : NGK 2707 · NGK 3006

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:
KTM EGS 125 1997
KTM EGS 125 1996
KTM EGS 125 1995
KTM EXC 125 1997
KTM EXC 125 1996
KTM EXC 125 1995
KTM GS 125 1994
KTM GS 125 1993
KTM GS 125 1992
KTM GS 125 1991
KTM GS 125 1990
KTM GS 125 1989
KTM GS 125 1988
KTM GS 125 1987
KTM MX 125 1994
KTM MX 125 1993
KTM MX 125 1992
KTM MX 125 1991
KTM MX 125 1990
KTM MX 125 1989
KTM MX 125 1988
KTM MX 125 1987
KTM SX 125 1997
KTM SX 125 1996
KTM SX 125 1995