WISECO Racer Elite Forged Piston for YAMAHA YZ 80, YZ 85 1993-2026

WISECO offers this piston kit for YAMAHA YZ 80, YZ 85 1993-2026. 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 WISECO?

Wiseco has forged its pistons in Mentor (Ohio, USA) since 1941 and controls the whole process, from aluminium bar to the friction-reducing ArmorGlide skirt coating. Its pistons are developed with Team Honda HRC in Supercross (450 class since 2018).

When should you replace the piston on your YAMAHA YZ 85?

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

• Size : 52.50 mm
• Manufacturer part number: WRE915M05250

Spare parts and items to plan

• Piston rings : WISECO W1869CS · WISECO W1890CS
• Piston pin : WISECO · WOSSNER
• Piston pin clips : WISECO 125 L · WOSSNER
• Top-end gasket kit : ATHENA M752005600094 · ATHENA M752008300094
• Small end needle bearing : ATHENA · PROX
• Spark plug : NGK 6801 · NGK 3830
• Coolant : LIQUI MOLY 1 L · TWIN AIR
• 2-stroke oil : LIQUI MOLY 1 L · MOTUL 1 L

Compatibility

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

Fits:
YAMAHA YZ 80 2001
YAMAHA YZ 80 2000
YAMAHA YZ 80 1999
YAMAHA YZ 80 1998
YAMAHA YZ 80 1997
YAMAHA YZ 80 1996
YAMAHA YZ 80 1995
YAMAHA YZ 80 1994
YAMAHA YZ 80 1993
YAMAHA YZ 85 2026
YAMAHA YZ 85 2025
YAMAHA YZ 85 2024
YAMAHA YZ 85 2023
YAMAHA YZ 85 2022
YAMAHA YZ 85 2021
YAMAHA YZ 85 2020
YAMAHA YZ 85 2019
YAMAHA YZ 85 2018
YAMAHA YZ 85 2017
YAMAHA YZ 85 2016
YAMAHA YZ 85 2015
YAMAHA YZ 85 2014
YAMAHA YZ 85 2013
YAMAHA YZ 85 2012
YAMAHA YZ 85 2011
YAMAHA YZ 85 2010
YAMAHA YZ 85 2009
YAMAHA YZ 85 2008
YAMAHA YZ 85 2007
YAMAHA YZ 85 2006
YAMAHA YZ 85 2005
YAMAHA YZ 85 2004
YAMAHA YZ 85 2003
YAMAHA YZ 85 2002