Engine test stand
For a engine up to .60 or so just take a piece of 3/4' plywood
& cut a "u" in it to fit the crank case, drill for bolts & nuts (not screws) . Bolt or C clamp it to something solid . . put the tank on or next to the board & hold it w/a bungee cord. note must be bolted/clamped down not hand held.