ATHENA Cylinder Base Gasket for KTM, HUSQVARNA and GAS GAS 2016-2025

The ATHENA cylinder base gasket is designed for KTM EXCF 450, EXCF 500, SXF 450, XCF 450, XCFW 450, HUSQVARNA FC 450, FE 450, FS 450, FX 450 and GAS GAS EXF 450, MCF 450 from 2016 to 2025. Fitted under the cylinder, the base gasket is more than just a seal: its thickness sets the height of the cylinder, and with it the engine's squish and compression.

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: S410270006116, S410270006117, S410270006118, S410270006104, S410270006119, S410270006120
• Available versions: 0.10 mm: ref. S410270006116; 0.20 mm: ref. S410270006117; 0.30 mm: ref. S410270006118; 0.40 mm: ref. S410270006104; 0.50 mm: ref. S410270006119; 0.60 mm: ref. S410270006120
• Weight: 50 g
• Engine: 4-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?

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 : ATHENA · CENTAURO
• Piston : VERTEX 23849 · VERTEX 23850
• Piston rings : WOSSNER · PROX
• 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: 0.10 mm, 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.60 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 EXF 450 2024
GAS GAS EXF 450 2023
GAS GAS EXF 450 2022
GAS GAS EXF 450 2021
GAS GAS MCF 450 2024
GAS GAS MCF 450 2023
GAS GAS MCF 450 2022
GAS GAS MCF 450 2021
HUSQVARNA FC 450 2025
HUSQVARNA FC 450 2024
HUSQVARNA FC 450 2023
HUSQVARNA FC 450 2022
HUSQVARNA FC 450 2021
HUSQVARNA FC 450 2020
HUSQVARNA FC 450 2019
HUSQVARNA FC 450 2018
HUSQVARNA FC 450 2017
HUSQVARNA FC 450 2016
HUSQVARNA FE 450 2025
HUSQVARNA FE 450 2024
HUSQVARNA FE 450 2023
HUSQVARNA FE 450 2022
HUSQVARNA FE 450 2021
HUSQVARNA FE 450 2020
HUSQVARNA FE 450 2019
HUSQVARNA FE 450 2018
HUSQVARNA FE 450 2017
HUSQVARNA FS 450 2025
HUSQVARNA FS 450 2024
HUSQVARNA FS 450 2023
HUSQVARNA FS 450 2022
HUSQVARNA FS 450 2021
HUSQVARNA FS 450 2020
HUSQVARNA FS 450 2019
HUSQVARNA FS 450 2018
HUSQVARNA FS 450 2017
HUSQVARNA FX 450 2024
HUSQVARNA FX 450 2023
HUSQVARNA FX 450 2022
HUSQVARNA FX 450 2021
HUSQVARNA FX 450 2020
HUSQVARNA FX 450 2019
HUSQVARNA FX 450 2018
HUSQVARNA FX 450 2017
KTM EXCF 450 2024
KTM EXCF 450 2023
KTM EXCF 450 2022
KTM EXCF 450 2021
KTM EXCF 450 2020
KTM EXCF 450 2019
KTM EXCF 450 2018
KTM EXCF 450 2017
KTM EXCF 500 2024
KTM EXCF 500 2023
KTM EXCF 500 2022
KTM EXCF 500 2021
KTM EXCF 500 2020
KTM EXCF 500 2019
KTM EXCF 500 2018
KTM EXCF 500 2017
KTM SXF 450 2025
KTM SXF 450 2024
KTM SXF 450 2023
KTM SXF 450 2022
KTM SXF 450 2021
KTM SXF 450 2020
KTM SXF 450 2019
KTM SXF 450 2018
KTM SXF 450 2017
KTM SXF 450 2016
KTM XCF 450 2025
KTM XCF 450 2024
KTM XCF 450 2023
KTM XCF 450 2022
KTM XCF 450 2021
KTM XCF 450 2020
KTM XCF 450 2019
KTM XCF 450 2018
KTM XCF 450 2017
KTM XCF 450 2016
KTM XCFW 450 2024
KTM XCFW 450 2023