If Wisconsin ever made a 2 stroke,I've yet to see one....but who knows?...just because I never saw one,dont mean there aint no such thing!..
I'd guess Lauson/Power-Products,or maybe Clinton,Jacobsen,or McCullogh??....cant tell by the photo..I've had a few Power-Products,they had no head OR head gasket,it was cast as part of the cylinder and the whole "jug" slid off the crankcase in one peice...
What are those things beside the engine??.one looks like a muffler,the other looks like a starter motor??....definately an odd duck!..