ATHENA Cylinder Base Gasket ref. S41027000614 for KTM, HUSQVARNA and GAS GAS 2023-2027

The ATHENA cylinder base gasket is designed for KTM EXC 150, SX 125, SX 150, XC 125, XCW 125, XCW 150, HUSQVARNA TC 125, TC 150, TE 125, TE 150 and GAS GAS EC 125, MC 125, MC 150 from 2023 to 2027. The base gasket seals between the cylinder and the crankcase. Its thickness matters: it sets the height of the cylinder, and therefore the squish, the compression and, on a two-stroke, the port timing.

Key features

• Several thicknesses available for the same bike.
• The right tool for setting squish, compression and timing, according to Athena.

Specifications

• Brand: ATHENA
• Manufacturer part numbers: S410270006145, S410270006141, S410270006142, S410270006143, S410270006144
• Available versions: 0.05 mm: ref. S410270006145; 0.20 mm: ref. S410270006141; 0.30 mm: ref. S410270006142; 0.40 mm: ref. S410270006143; 0.50 mm: ref. S410270006144
• Weight: 20 g
• Engine: 2-stroke

Choosing the right thickness

Measure the thickness of the old gasket with a vernier caliper and fit the same, unless you are deliberately adjusting the squish. A thicker gasket increases the squish and lowers compression; a thinner one does the opposite. After any change of thickness, check the squish with solder wire.

When to replace it?

• Oil or coolant seeping at the base of the cylinder.
• Gasket crushed or torn on removal.

Every time the cylinder is removed: a crushed base gasket can't be reused.

Fitting tips

1. Clean the crankcase face and the base of the cylinder without scratching them.
2. Fit the gasket dry, centred on the studs.
3. Tighten the cylinder in a criss-cross pattern to the manufacturer's torque.
4. If you have changed the thickness, measure the squish before refitting the cylinder head with a new head gasket.

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
• Piston rings : VERTEX 53007805400 · VERTEX 55910005400N
• Coolant : LIQUI MOLY 1 L · TWIN AIR

Frequently asked questions

Which thickness should I choose?
The same as your original gasket, unless you are deliberately adjusting the squish. Thicknesses available: 0.05 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm.

Should the other gaskets be replaced?
Yes, as soon as the cylinder is removed: a top end gasket kit includes all the gaskets that need replacing.

Compatibility

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

Fits:
GAS GAS EC 125 2025
GAS GAS MC 125 2027
GAS GAS MC 125 2026
GAS GAS MC 125 2025
GAS GAS MC 125 2024
GAS GAS MC 150 2025
HUSQVARNA TC 125 2027
HUSQVARNA TC 125 2026
HUSQVARNA TC 125 2025
HUSQVARNA TC 125 2024
HUSQVARNA TC 125 2023
HUSQVARNA TC 150 2025
HUSQVARNA TE 125 2027
HUSQVARNA TE 125 2026
HUSQVARNA TE 125 2025
HUSQVARNA TE 150 2027
HUSQVARNA TE 150 2026
HUSQVARNA TE 150 2025
HUSQVARNA TE 150 2024
KTM EXC 150 2025
KTM EXC 150 2024
KTM SX 125 2027
KTM SX 125 2026
KTM SX 125 2025
KTM SX 125 2024
KTM SX 125 2023
KTM SX 150 2025
KTM XC 125 2027
KTM XC 125 2026
KTM XC 125 2025
KTM XC 125 2024
KTM XC 125 2023
KTM XCW 125 2027
KTM XCW 125 2026
KTM XCW 125 2025
KTM XCW 150 2027
KTM XCW 150 2026
KTM XCW 150 2025
KTM XCW 150 2024