Ducati Diavel Workshop Manual page 825

Crankcase assembly: crankshaft/connecting rods assembly
Crankshaft class
B
B
A
A
Crankshaft
The main bearing and big-end journals should not be scored or grooved;
the threads, keyways, and slots must be in good condition.
Check for fretting or burrs in the fillet between journal and shoulder.
Fillet radius: 2 mm.
Use a micrometer to measure oval and taper of the crank pin. Measure oval and taper in several different directions.
Use a dial gauge to measure the alignment of the main journals by setting the crankshaft between two opposing centres.
At each overhaul, it is advisable to clean the crankshaft's internal oilways.
The prescribed values are given in Sect. 3 - 1.1, Crankshaft.
The crankshaft is supplied in two size classes (connecting rod pin) A and B, as punch marked on the side of the crank web
on the pinion side.
Connecting rod class Bearings colour
B BLUE/YELLOW
A YELLOW/YELLOW
B BLUE/BLUE
A BLUE/YELLOW