Undersize Bearing Usage Guide

WARNING: This page is about a different variant/trim than selected.

When the specified main bearing oil clearance is not obtained with standard size main bearings, use underside (US) bearing.
When using undersize (US) bearing, measure the main bearing inner diameter with bearing installed, and grind main journal so that the main bearing oil clearance satisfies the standard.
CAUTION: In grinding crankshaft main journal to use undersize bearings, keep the fillet R [1.5 - 1.7 mm (0.059 - 0.067 in)].

Fig 1: Identifying Crankshaft Pins And Journal
Courtesy of SUZUKI OF AMERICA CORP.