Hi Watson,

It will be there, cos if it's not yours will be the only Briggs engine that doesn't have its numbering.

Looking at the side of the engine that has the 2.5 HP decal on it, just follow around to the left at the same height as the decal towards the carby and it will be there on that same section, yes that is the engine air cowling.
You really have to look carefully as sometimes the paint is a tad thick and fills up the numbers, especially if its been repainted at some stage.

See how you go.

Cheers,
BB

I live a 24 Hour lifestyle, but every now and again I seem to fall asleep, well at least that's what my wife tells me.