Wössner Forged Piston for HM CRE 250 F, CRE 250 X, MOTARD 250 F and HONDA CRF 250, CRF 250 X 2004-2017

WOSSNER offers this piston kit for HM CRE 250 F, CRE 250 X, MOTARD 250 F and HONDA CRF 250, CRF 250 X 2004-2017. 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 Honda CRF R / RX / X):

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

Specifications and fitting tips

• Material: Aluminium
• Specificity: Double Bridge Forging
• Piston type: Forged
• Rings Quantity: 2
• Stroke: 2T
• Forged piston

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 77.95 mm, B = 77.96 mm, C = 77.97 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 : MOOSE · ITALKIT engine gasket pack for HONDA C…
• Spark plug : NGK R0409B · NGK R0451B
• 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:
HM CRE 250 F 2011
HM CRE 250 F 2010
HM CRE 250 F 2009
HM CRE 250 F 2008
HM CRE 250 F 2007
HM CRE 250 F 2006
HM CRE 250 F 2005
HM CRE 250 F 2004
HM CRE 250 X 2013
HM CRE 250 X 2012
HM CRE 250 X 2011
HM CRE 250 X 2010
HM CRE 250 X 2009
HM CRE 250 X 2008
HM CRE 250 X 2007
HM CRE 250 X 2006
HM CRE 250 X 2005
HM CRE 250 X 2004
HM MOTARD 250 F 2013
HM MOTARD 250 F 2012
HM MOTARD 250 F 2011
HM MOTARD 250 F 2010
HM MOTARD 250 F 2009
HM MOTARD 250 F 2008
HM MOTARD 250 F 2007
HM MOTARD 250 F 2006
HM MOTARD 250 F 2005
HM MOTARD 250 F 2004
HONDA CRF 250 2005
HONDA CRF 250 2004
HONDA CRF 250 X 2017
HONDA CRF 250 X 2016
HONDA CRF 250 X 2015
HONDA CRF 250 X 2014
HONDA CRF 250 X 2013
HONDA CRF 250 X 2012
HONDA CRF 250 X 2011
HONDA CRF 250 X 2010
HONDA CRF 250 X 2009
HONDA CRF 250 X 2008
HONDA CRF 250 X 2007
HONDA CRF 250 X 2006
HONDA CRF 250 X 2005
HONDA CRF 250 X 2004