FNM HPE Series Owner's Manual page 14

The engine serial number is also printed on the engine block. The position is indicated in the table
below (see also paragraph Main components of FNM
Engine
HPE 40S/80/80SD/110/110JD
HPE/P 40/150/150JD/170/170JD/190/190JD
HPE/P 100/225/225JD/250/250JD/250H
HPE/P 300
HPEL 45
HPEL 80
HPEL 65/90
10
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engine, HPE Series on page 15):
Engine serial number position
On the crankcase, right side, bell housing connection.
On the crankcase, front side, above the bell housing.
On the crankcase, right side, bell housing connection.
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FNM HPE Series