That s/n comes up as a made in Belgium engine:
2,5 2.5 1-cyl 9741139 9792524 1993 Belgium
From here:
Mercury 2-takt, 1-cyl, 2,2 - 5 hp, produktions?r, modellguide
Parts List:
2.5/3 HP(NON-SHIFT) - Mercury, Mercruiser, Force, etc. Parts Lookup
The service manual you require is 90-44477-1 and I can send you a copy if you PM me with an email address.
Gerry