I'm thinking of making up a portable engine driven battery charger and thought a Victa engine would suit that sort of application but would replacing the cutter base plate with a V belt pulley provide enough flywheel inertia to enable it to start & run without any alternator load?

The alternative would be to use a 'proper' 1990's Briggs & Stratton Quantum or a horizontal shaft engine, but the Victa is very light compared to the other 4 strokes, which makes it a lot easier to cart around.