ATHENA Cylinder Base Gasket for KTM EXC, SX, XCW 125, 150, HUSQVARNA TC, TE, TX 125, 150 and GAS GAS MC 125 2016-2023

The ATHENA cylinder base gasket is designed for KTM EXC 150, SX 125, SX 150, XCW 125, XCW 150, HUSQVARNA TC 125, TE 150, TX 125 and GAS GAS MC 125 from 2016 to 2023. 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: S410270006106, S410270006107, S410270006108, S410270006109, S410270006110
• Available versions: 0.20 mm: ref. S410270006106; 0.30 mm: ref. S410270006107; 0.40 mm: ref. S410270006108; 0.50 mm: ref. S410270006109; 0.75 mm: ref. S410270006110
• Weight: 30 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?

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 24419A · VERTEX 24243A
• Piston rings : PROX 02.6225 · PROX 02.6220
• 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: 0.20 mm, 0.30 mm, 0.40 mm, 0.50 mm, 0.75 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 MC 125 2023
GAS GAS MC 125 2022
GAS GAS MC 125 2021
HUSQVARNA TC 125 2022
HUSQVARNA TC 125 2021
HUSQVARNA TC 125 2020
HUSQVARNA TC 125 2019
HUSQVARNA TC 125 2018
HUSQVARNA TC 125 2017
HUSQVARNA TC 125 2016
HUSQVARNA TE 150 2023
HUSQVARNA TE 150 2022
HUSQVARNA TE 150 2021
HUSQVARNA TE 150 2020
HUSQVARNA TE 150 2019
HUSQVARNA TE 150 2018
HUSQVARNA TE 150 2017
HUSQVARNA TX 125 2022
HUSQVARNA TX 125 2021
HUSQVARNA TX 125 2020
HUSQVARNA TX 125 2019
HUSQVARNA TX 125 2018
HUSQVARNA TX 125 2017
KTM EXC 150 2023
KTM EXC 150 2022
KTM EXC 150 2021
KTM EXC 150 2020
KTM SX 125 2022
KTM SX 125 2021
KTM SX 125 2020
KTM SX 125 2019
KTM SX 125 2018
KTM SX 125 2017
KTM SX 125 2016
KTM SX 150 2022
KTM SX 150 2021
KTM SX 150 2020
KTM SX 150 2019
KTM SX 150 2018
KTM SX 150 2017
KTM SX 150 2016
KTM XCW 125 2019
KTM XCW 125 2018
KTM XCW 125 2017
KTM XCW 150 2023
KTM XCW 150 2022
KTM XCW 150 2021
KTM XCW 150 2020
KTM XCW 150 2019
KTM XCW 150 2018
KTM XCW 150 2017