WOSSNER piston kit for HONDA CR 250 R from 1997 to 2001

WOSSNER offers this piston kit for HONDA CR 250 R from 1997 to 2001. 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 HONDA CR 250 R?

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 CR 125 R / CR 250 R):

• Racing: every 7.5 h.
• Leisure: no Honda figure; Cross-Mania guideline: compression check at around 15 h.

Specifications and fitting tips

• Contents: Piston #8001DA, Ring Set #RSB6640, Wrist Pin #WP033, Retaining Clips #CW18
• Displacement: 249 cm³
• Stroke: 72.00 mm
• Piston material: Aluminium alloy, Forged
• Style: Standard size A
• Engine: 2-stroke
• Pistons feature a high-quality permanent skirt coating to reduce friction and noise and improve performance

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore).

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 · MOOSE
• Spark plug : NGK 3130 · NGK 3230
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063
• Air filter : TWIN AIR 150204 · TWIN AIR 160000GP

Compatibility

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

Fits:
HONDA CR 250 R 2001
HONDA CR 250 R 2000
HONDA CR 250 R 1999
HONDA CR 250 R 1998
HONDA CR 250 R 1997