Piston, Engine

Standard nominal diameter 89.9 (3.5393 in)
Piston Diameter [A] 89.873 - 89.879mm (3.5383 - 3.5385 in)
Piston Diameter [X] 89.878 - 89.886 mm (3.5385 - 3.5388 in)
Piston Diameter [B] 89.885 - 89.891mm ( 3.5387 - 3.5390 in)

1st repair size + 0.25 (0.0098 in)
Piston Diameter [A] 90.123 - 90.129mm (3.5481 - 3.5483 in)
Piston Diameter [X] 90.128 - 90.136mm (3.5483 - 3.5486 in)
Piston Diameter [B] 90.135 - 90.141mm (3.5486 - 3.5488 in)

2nd repair size + 0.5 (0.0196 in)
Piston Diameter [A] 90.373 - 90.379mm (3.5579 - 3.5582 in)
Piston Diameter [X] 90.378 - 90.386mm (3.5581 - 3.5585 in)
Piston Diameter [B] 90.385 - 90.391mm (3.5584 - 3.5587 in)

[A],[X],[B] The group code letters are located on the piston crown and are stamped in the contact surface of the crankcase.