ATHENA Exhaust Gasket for KTM, HUSQVARNA and GAS GAS 2023-2025

The ATHENA S410270012029 exhaust gasket is designed for KTM EXCF 250, EXCF 350, SXF 250, SXF 350, XCF 250, XCF 350, GAS GAS ECF 250, ECF 350, EXF 250, EXF 350, MCF 250, MCF 350 and HUSQVARNA FC 250, FC 350, FE 250, FE 350, FX 350 from 2023 to 2025. At the junction between the engine and the exhaust, this gasket has to cope with very hot gases and vibration. Crushed or hardened, it lets gases escape: noise, spitting and loss of power.

Specifications

• Brand: ATHENA
• Manufacturer part number: S410270012029
• EAN code: 8051757165339
• Engine: 4-stroke

When to replace it?

• Black or oily marks at the exhaust outlet.
• Spitting, a leaking noise at idle, backfiring on deceleration.
• Gasket crushed, brittle or burnt on removal.

Every time the header pipe or expansion chamber is removed, and as soon as a leak appears.

Fitting tips

1. Clean the gasket seat on both the engine side and the exhaust side.
2. Offer up the exhaust without forcing it, fit all the fasteners, then tighten progressively.
3. Warm the engine up, let it cool down and check the tightness again.

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
• Spark plug : NGK 97225 · NGK 3521

Frequently asked questions

Can I reuse the old gasket?
No: it crushes and deforms as it heats up. A new gasket costs little and prevents a leak.

Compatibility

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

Fits:
GAS GAS ECF 250 2024
GAS GAS ECF 350 2024
GAS GAS EXF 250 2024
GAS GAS EXF 350 2024
GAS GAS MCF 250 2024
GAS GAS MCF 350 2024
HUSQVARNA FC 250 2025
HUSQVARNA FC 250 2024
HUSQVARNA FC 250 2023
HUSQVARNA FC 350 2025
HUSQVARNA FC 350 2024
HUSQVARNA FC 350 2023
HUSQVARNA FE 250 2025
HUSQVARNA FE 250 2024
HUSQVARNA FE 350 2025
HUSQVARNA FE 350 2024
HUSQVARNA FX 350 2024
HUSQVARNA FX 350 2023
KTM EXCF 250 2024
KTM EXCF 350 2024
KTM SXF 250 2025
KTM SXF 250 2024
KTM SXF 250 2023
KTM SXF 350 2025
KTM SXF 350 2024
KTM SXF 350 2023
KTM XCF 250 2025
KTM XCF 250 2024
KTM XCF 250 2023
KTM XCF 350 2025
KTM XCF 350 2024
KTM XCF 350 2023