PROX piston kit for YAMAHA PW 50, PW 80 from 1983 to 2006

PROX offers this piston kit for YAMAHA PW 50, PW 80 from 1983 to 2006. 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 cast piston?

A cast piston is made by pouring liquid aluminium into a mould: it is what most manufacturers fit as standard, especially on two-strokes.

• High-silicon alloy: it expands little, is fitted with tight clearance and stays quiet when cold.
• Good wear resistance of the skirt and ring grooves.
• Lower price than a forged piston, for OEM quality in normal use.
• Limit: less tolerant of overheating and highly tuned engines.

Why choose PROX?

ProX has its pistons made in Japan and the USA, with Japanese rings (Riken, TP or NPR) and tolerances at least equal to OEM; most of its four-stroke pistons are forged.

When should you replace the piston on your YAMAHA PW 80?

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 15 h in hard use and every 30 h for leisure.

Specifications and fitting tips

• Bore: 47.00 mm
• Oversize: Standard
• Displacement: 80 cm³
• Piston material: Aluminium alloy, Cast
• Skirt coating: Uncoated
• Precision machined on state-of-the-art CNC equipment

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 : PROX 35.2005 · PROX 35.2008
• Spark plug : NGK
• 2-stroke oil : LIQUI MOLY 1 L 3065 · LIQUI MOLY 1 L 3063
• Air filter : TWIN AIR · TECNIUM

Compatibility

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

Fits:
YAMAHA PW 50 2006
YAMAHA PW 50 2005
YAMAHA PW 50 2004
YAMAHA PW 50 2003
YAMAHA PW 50 2002
YAMAHA PW 50 2001
YAMAHA PW 50 2000
YAMAHA PW 50 1999
YAMAHA PW 50 1998
YAMAHA PW 50 1997
YAMAHA PW 50 1996
YAMAHA PW 50 1995
YAMAHA PW 50 1994
YAMAHA PW 50 1993
YAMAHA PW 50 1992
YAMAHA PW 50 1991
YAMAHA PW 50 1988
YAMAHA PW 50 1983
YAMAHA PW 80 2006
YAMAHA PW 80 2005
YAMAHA PW 80 2004
YAMAHA PW 80 2003
YAMAHA PW 80 2002
YAMAHA PW 80 2001
YAMAHA PW 80 2000
YAMAHA PW 80 1999
YAMAHA PW 80 1998
YAMAHA PW 80 1997
YAMAHA PW 80 1996
YAMAHA PW 80 1995
YAMAHA PW 80 1994
YAMAHA PW 80 1993
YAMAHA PW 80 1992
YAMAHA PW 80 1991
YAMAHA PW 80 1986
YAMAHA PW 80 1985
YAMAHA PW 80 1984
YAMAHA PW 80 1983