Wössner Forged Piston for YAMAHA XTZ 660 TENERE, YFM 660 RAPTOR 2WD, YFM 700 GRIZZLY EPS 4WD, YXR 660 RHINO 4WD 1991-2008

WOSSNER offers this piston kit for YAMAHA XTZ 660 TENERE, YFM 660 RAPTOR 2WD, YFM 700 GRIZZLY EPS 4WD, YFM 700 GRIZZLY EPS CAMO 4WD, YXR 660 RHINO 4WD 1991-2008. 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 YAMAHA XTZ 660 TENERE?

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

• Material: Aluminium
• Piston compression: Standard
• Rings Quantity: 3
• Stroke: 4T
• Forged piston
• Anti friction coated skirt

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 : 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 XTZ 660 TENERE 1996
YAMAHA XTZ 660 TENERE 1995
YAMAHA XTZ 660 TENERE 1994
YAMAHA XTZ 660 TENERE 1993
YAMAHA XTZ 660 TENERE 1992
YAMAHA XTZ 660 TENERE 1991
YAMAHA YFM 660 RAPTOR 2WD 2005
YAMAHA YFM 660 RAPTOR 2WD 2004
YAMAHA YFM 660 RAPTOR 2WD 2003
YAMAHA YFM 660 RAPTOR 2WD 2002
YAMAHA YFM 660 RAPTOR 2WD 2001
YAMAHA YFM 700 GRIZZLY EPS 4WD 2008
YAMAHA YFM 700 GRIZZLY EPS 4WD 2007
YAMAHA YFM 700 GRIZZLY EPS CAMO 4WD 2008
YAMAHA YFM 700 GRIZZLY EPS CAMO 4WD 2007
YAMAHA YXR 660 RHINO 4WD 2007
YAMAHA YXR 660 RHINO 4WD 2006
YAMAHA YXR 660 RHINO 4WD 2005