Yamaha Z250D Service-Handbuch - Seite 12

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GEN

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

S60V1140

60V3E11