ATHENA Forged Piston for FANTIC XEF 310 2023-2025

ATHENA offers this piston kit for FANTIC XEF 310 2023-2025. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why choose a forged piston?

Instead of simply being cast, a forged piston is hot-pressed under very high pressure and then machined: its metal is denser and free of air pockets.

• Stronger when hot: it copes better with high revs, overheating and detonation.
• Lighter for the same strength: less stress on the connecting rod and bearings.
• Good to know: depending on the alloy, it expands a little more and is fitted with more clearance; slight noise when cold is normal.
• Why does it cost more? Forging tools, full machining and surface treatments cost more than simple casting.

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 FANTIC XEF 310?

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 hour figure for this model. Cross-Mania guideline: compression check every 30 h in hard use and every 60 h for leisure.

Specifications and fitting tips

• Engine: 4-stroke
• Manufacturer part numbers: S5F08500007A (A), S5F08500007B (B), S5F08500007C (C)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 84.94 mm, B = 84.95 mm, C = 84.96 mm.

Spare parts and items to plan

• ATHENA cylinder kit : ATHENA
• Top end gasket kit : ATHENA
• Spark plug : NGK
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50

Compatibility

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

Fits:
FANTIC XEF 310 2025
FANTIC XEF 310 2024
FANTIC XEF 310 2023