WOSSNER piston kit for KAWASAKI KX 250 F from 2011 to 2014 - 8814D

WOSSNER offers this piston kit for KAWASAKI KX 250 F from 2011 to 2014. 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 KAWASAKI KX 250 F?

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 Kawasaki KX 250 F / KX 450 F (four-stroke)):

• Racing: every 15 h (about 6 races).
• Leisure: no Kawasaki figure; Cross-Mania guideline: compression check at around 30 h.

Specifications and fitting tips

• Contents: Piston #8814DA, Ring Set #RIK77.00D, Wrist Pin #WP070-SP, Retaining Clips #CW16
• Stroke: 53.60 mm
• Piston material: Aluminium alloy, Forged
• Style: Standard size A
• Compression ratio: 13.5:1
• Engine: 4-stroke
• Optimized wrist pin lubrication with oil slots, radial machining and annular grooves

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 77.00 mm, B = 77.01 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 : ATHENA S410250015039 · ATHENA R2506-047
• Spark plug : NGK 6508 · NGK 6607
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
• Air filter : TECNIUM · TWIN AIR

Compatibility

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

Fits:
KAWASAKI KX 250 F 2014
KAWASAKI KX 250 F 2013
KAWASAKI KX 250 F 2012
KAWASAKI KX 250 F 2011