Pistons And Connecting Rods - Yamaha Z250D Service Manual

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INFO

Pistons and connecting rods

The pistons and connecting rods have been processed as follows to increase durability.
• Heat resisting, lightweight aluminum forged pistons have been adopted.
• Highly carbonized connecting rods have been adopted.
• The piston rings have been processed with a hard chrome plating that has a thickness of 50
microns.
• The big end bearings have been processed with 18 rollers, 2 rollers more than those of the VX250
(250C), and with oil grooves around the outer race of the bearings.
• The small ends of the connecting rods have been processed with a special heat treatment.
• Oil grooves have been processed around the outer peripheries of the 2nd piston rings.
1 2nd piston ring
È Oil groove
1-7
General information
È
1
S60V1140
60V3E11