VHM Piston Kit ref. APYZ08521757 for YAMAHA YZ 85 2002-2026

VHM offers this piston kit for YAMAHA YZ 85 2002-2026. The piston slides in the cylinder and takes the force of the air-fuel combustion, passing it to the connecting rod and crankshaft.

Why replace the piston?

The benefits:

• Restore compression, power and easy starting.
• A piston of the right size keeps the intended clearance in the cylinder: less noise and less oil consumption.
• A new piston with rings, pin and clips: nothing to reuse from the old one.

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

• Manufacturer part numbers: APYZ08521757A (A), APYZ08521757B (B), APYZ08521757C (C), APYZ08521757D (D)

Available in several sizes: choose the one that matches your cylinder (stamped size or measured bore). Diameters: A = 47.45 mm, B = 47.46 mm, C = 47.47 mm, D = 47.48 mm.

Spare parts and items to plan

• Piston rings : PROX · WISECO
• Piston pin : WISECO · WOSSNER
• Piston pin clips : WISECO 125 L · WOSSNER
• Top-end gasket kit : VHM · ATHENA
• 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 · LIQUI MOLY 4 L

Compatibility

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

Fits:
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