Wössner Forged Piston for KTM EXC 500, EXCF 500, HUSABERG FE 501 and HUSQVARNA FE 501 1995-2023

WOSSNER offers this piston kit for KTM EXC 500, EXCF 500, HUSABERG FE 501 and HUSQVARNA FE 501 1995-2023. 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?

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

Recommended hours for a top-end rebuild (manufacturer recommendation for the KTM EXC-F, Husqvarna FE 2017-2023):

• Racing: every 70 h.
• Leisure: every 135 h.

Specifications and fitting tips

• Material: Aluminium
• Specificity: Double Bridge Forging
• Rings Quantity: 2
• Stroke: 4T
• Forged piston
• Anti friction coated skirt

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: B = 94.96 mm, C = 94.97 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 · TECNIUM
• Spark plug : NGK 95680 · NGK 6706
• 2-stroke oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
• Air filter : HIFLO FILTRO · TECNIUM

Compatibility

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

Fits:
HUSABERG FE 501 2000
HUSABERG FE 501 1999
HUSABERG FE 501 1998
HUSABERG FE 501 1997
HUSABERG FE 501 1996
HUSABERG FE 501 1995
HUSQVARNA FE 501 2019
HUSQVARNA FE 501 2018
HUSQVARNA FE 501 2017
HUSQVARNA FE 501 2016
HUSQVARNA FE 501 2015
HUSQVARNA FE 501 2014
KTM EXC 500 2016
KTM EXC 500 2015
KTM EXC 500 2014
KTM EXC 500 2013
KTM EXC 500 2012
KTM EXCF 500 2023
KTM EXCF 500 2022
KTM EXCF 500 2021
KTM EXCF 500 2020
KTM EXCF 500 2019
KTM EXCF 500 2018
KTM EXCF 500 2017