Method by Calculation

Install main bearings to cylinder block and lower cylinder block, and tighten lower cylinder block bolts to the specified torque. Refer to [ENGINE UNIT: DISASSEMBLY AND ASSEMBLY ] for the tightening procedure.
Measure the inner diameter of main bearing with a bore gauge.

Fig 1: Identifying Inner Diameter Of Main Bearing
Courtesy of SUZUKI OF AMERICA CORP.

(Bearing oil clearance) = (Main bearing inner diameter) - (Crankshaft main journal diameter)

Standard:

No. 1, 3 and 5 journals: 0.028 - 0.042 mm (0.0011 - 0.0017 in)

No. 2 and 4 journals: 0.041 - 0.056 mm (0.0016 - 0.0022 in)

Limit: 0.1 mm (0.004 in)
If the clearance exceeds the limit, select proper main bearing according to main bearing inner diameter and crankshaft main journal diameter to obtain the specified bearing oil clearance. Refer to [HOW TO SELECT PISTON AND BEARING ].