WOSSNER piston kit for KTM SX-F 450 from 2007 to 2012

WOSSNER offers this piston kit for KTM SX-F 450 from 2007 to 2012. 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 SX-F 450?

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

• Bore: 77.00 mm
• Displacement: 400 cm³
• Piston diameter: 96.96 mm
• Piston material: Aluminium alloy, Forged
• Ring material: Nitride coating, Steel, Cast
• Forged piston: aerospace-grade aluminium alloy, closed-die forged for high tensile and fatigue strength

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 : COMETIC · MOOSE
• Spark plug : NGK 2305 · NGK 6706
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
• Air filter : TWIN AIR over-filter for FANTIC, GAS G… · TWIN AIR GP Sand Stop overfilter for F…

Compatibility

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

Fits:
KTM SX-F 450 2012
KTM SX-F 450 2011
KTM SX-F 450 2010
KTM SX-F 450 2009
KTM SX-F 450 2008
KTM SX-F 450 2007