PROX piston kit for YAMAHA XT 660 R, XT 660 X, XT 660 Z, XT 660 Z ABS from 2004 to 2013

PROX offers this piston kit for YAMAHA XT 660 R, XT 660 X, XT 660 Z, XT 660 Z ABS from 2004 to 2013. 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 XT 660 R?

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 50 h in hard use and every 100 h for leisure.

Specifications and fitting tips

• Piston diameter: 99.96 mm
• Piston material: Aluminium alloy, Cast
• Ring material: Steel
• Style: Cast Replica
• Piston size: Standard size B
• ProX cast pistons offer high stability

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 : see the selection
• Spark plug : see the selection
• 4-stroke engine oil : LIQUI MOLY 10W40 1 L · MOTUL 10W50
• Air filter : see the selection

Compatibility

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

Fits:
YAMAHA XT 660 R 2011
YAMAHA XT 660 R 2010
YAMAHA XT 660 R 2009
YAMAHA XT 660 R 2008
YAMAHA XT 660 R 2007
YAMAHA XT 660 R 2006
YAMAHA XT 660 R 2005
YAMAHA XT 660 R 2004
YAMAHA XT 660 X 2011
YAMAHA XT 660 X 2010
YAMAHA XT 660 X 2009
YAMAHA XT 660 X 2008
YAMAHA XT 660 X 2007
YAMAHA XT 660 X 2006
YAMAHA XT 660 X 2005
YAMAHA XT 660 X 2004
YAMAHA XT 660 Z 2013
YAMAHA XT 660 Z 2012
YAMAHA XT 660 Z 2011
YAMAHA XT 660 Z 2010
YAMAHA XT 660 Z 2009
YAMAHA XT 660 Z 2008
YAMAHA XT 660 Z ABS 2011