ATHENA Racing Forged Piston for KTM EGS 300, EXC 300, GS 300, MX 300, SX 300, XC 300 1996-2005

ATHENA offers this piston kit for KTM EGS 300, EXC 300, GS 300, MX 300, SX 300, XC 300 1996-2005. 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 KTM EXC 300?

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 20 h in hard use and every 40 h for leisure.

Specifications and fitting tips

• Engine: 2-stroke
• Manufacturer part numbers: S4F07200001A (A), S4F07200001B (B), S4F07200001C (C)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 71.93 mm, B = 71.94 mm, C = 71.95 mm.

Spare parts and items to plan

• Piston rings : ATHENA · VERTEX
• Piston pin : WOSSNER CW18 · WOSSNER WP033
• Piston pin clips : WISECO · VERTEX
• Top-end gasket kit : ATHENA M752007800094 · ATHENA M752010500094
• Small end needle bearing : PROX · WOSSNER
• Spark plug : NGK 6664 · NGK 97225
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 800 1 L

Compatibility

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

Fits:
KTM EGS 300 2003
KTM EGS 300 2002
KTM EGS 300 2001
KTM EGS 300 2000
KTM EGS 300 1999
KTM EGS 300 1998
KTM EGS 300 1997
KTM EGS 300 1996
KTM EXC 300 2005
KTM EXC 300 2004
KTM EXC 300 2003
KTM EXC 300 2002
KTM EXC 300 2001
KTM EXC 300 2000
KTM EXC 300 1999
KTM EXC 300 1998
KTM EXC 300 1997
KTM EXC 300 1996
KTM GS 300 2003
KTM GS 300 2002
KTM GS 300 2001
KTM GS 300 2000
KTM GS 300 1999
KTM GS 300 1998
KTM GS 300 1997
KTM GS 300 1996
KTM MX 300 2003
KTM MX 300 2002
KTM MX 300 2001
KTM MX 300 2000
KTM MX 300 1999
KTM MX 300 1998
KTM MX 300 1997
KTM MX 300 1996
KTM SX 300 2003
KTM SX 300 2002
KTM SX 300 2001
KTM SX 300 2000
KTM SX 300 1999
KTM SX 300 1998
KTM SX 300 1997
KTM SX 300 1996
KTM XC 300 2003
KTM XC 300 2002
KTM XC 300 2001
KTM XC 300 2000
KTM XC 300 1999
KTM XC 300 1998
KTM XC 300 1997
KTM XC 300 1996