ATHENA cast piston Top End Kit (Piston + Gaskets) ref. P4C0540097020 for KTM, HUSQVARNA and GAS GAS 2023-2027

ATHENA offers this top-end kit for KTM SX, XC, XCW 125, HUSQVARNA TC, TE 125 and GAS GAS EC, MC 125 2023-2027. It combines a complete piston (rings, pin and clips) with the gaskets to replace at the same time: base, head and related seals depending on the engine.

Why a piston + gasket kit?

The benefits:

• One part number to rebuild the top end: nothing is forgotten at reassembly.
• Cheaper than buying the piston and gasket kit separately.
• New gaskets guarantee compression from the very first start.

Why choose ATHENA?

Athena, the Italian manufacturer founded in 1973, is an original-equipment supplier to manufacturers such as KTM and Ducati: the same standards for your replacement parts.

When should you replace the piston on your HUSQVARNA TC 125?

Harder starting, loss of power, blue smoke, oil consumption or a knock when cold: these are the signs of a tired top end.

No manufacturer figure in hours for this model. Cross-Mania guideline: compression check every 20 h of hard use and every 40 h of leisure riding.

Specifications and fitting tips

• Engine: 2-stroke
• Manufacturer part numbers: P4C0540097020A (A), P4C0540097020B (B), P4C0540097020C (C), P4C0540097020D (D)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 53.94 mm, B = 53.95 mm, C = 53.96 mm, D = 53.97 mm.

Spare parts and items to plan

• Piston rings : VERTEX · PROX
• Piston pin : VERTEX · WOSSNER
• Small end needle bearing : PROX · NTN
• Spark plug : NGK 2707 · NGK 4492
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 2-stroke oil : LIQUI MOLY 1 L · LIQUI MOLY 4 L

Compatibility

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

Fits:
GAS GAS EC 125 2026
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
HUSQVARNA TC 125 2027
HUSQVARNA TC 125 2026
HUSQVARNA TC 125 2025
HUSQVARNA TC 125 2024
HUSQVARNA TC 125 2023
HUSQVARNA TE 125 2027
HUSQVARNA TE 125 2026
HUSQVARNA TE 125 2025
KTM SX 125 2027
KTM SX 125 2026
KTM SX 125 2025
KTM SX 125 2024
KTM SX 125 2023
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