Yamaha Z300A Supplementary Service Manual page 12

GEN
INFO
• Newly-forged lightweight pistons with a hard anodic coating on the piston pin boss have been
adopted to increase durability and reduce the inertia mass of the pistons.
• The top piston rings are made of steel and are ion-plated to increase durability.
• The heat treatments for the piston pins and connecting rods have been changed so that there is
multiphase carbonization to increase durability.
1 Ion plating (chromium)
2 Identification mark: R
3 Identification mark: 6D0
4 Oil groove
5 Hard anodic coating
6 Identification mark
5
General information
È Top ring
É Second ring
6D03F1X