ORIGINAL: big max 1935
Looks D&S to me . Should have name stamped on rear of engine . The 1940 version had a side intake . Looks like yours if missing the timer assy or I can't see it in the pictures. Max H.
Thanks Max. Is the timer assembly the copper or brass ring with what looks like a wire clamp and maybe a magnet mounted behind the prop as shown in this pic? Fyi this engine is available for a fair price, if any interest PM me.