Wössner Forged Piston for KTM EGS 125, EXC 125, EXC 125 MARZOCCHI/OHLINS, SX 125 1994-2000

WOSSNER offers this piston kit for KTM EGS 125, EXC 125, EXC 125 MARZOCCHI/OHLINS, SX 125 1994-2000. 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 WOSSNER?

Wössner has forged its own pistons since 1994: Molykote-coated skirt to reduce friction and ease running-in, kit supplied complete with rings, pin and clips.

When should you replace the piston on your KTM EXC 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 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

• Material: Aluminium
• Piston type: Forged
• Rings Quantity: 1
• Stroke: 2T
• Forged piston
• Anti friction coated skirt

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 54.19 mm, B = 54.20 mm.

Cross-Mania tip: Measure the cylinder bore before ordering: the piston must match your cylinder size. Follow the manufacturer's break-in procedure and replace the top-end gaskets at the same time.

Also needed with this part

• Top-end gasket kit : CENTAURO · PROX
• Spark plug : NGK 2707 · NGK 3981
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063
• Air filter : TWIN AIR · TWIN AIR over-filter for FANTIC, GAS G…

Compatibility

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

Fits:
KTM EGS 125 1999
KTM EGS 125 1998
KTM EGS 125 1997
KTM EGS 125 1996
KTM EXC 125 2000
KTM EXC 125 1999
KTM EXC 125 1998
KTM EXC 125 1997
KTM EXC 125 1996
KTM EXC 125 1995
KTM EXC 125 1994
KTM EXC 125 MARZOCCHI/OHLINS 1997
KTM EXC 125 MARZOCCHI/OHLINS 1996
KTM EXC 125 MARZOCCHI/OHLINS 1995
KTM EXC 125 MARZOCCHI/OHLINS 1994
KTM SX 125 2000
KTM SX 125 1999
KTM SX 125 1998
KTM SX 125 1997
KTM SX 125 1996
KTM SX 125 1995
KTM SX 125 1994