All Wisconsin Engines products sold since 1939 have been issued serial numbers. Feel free to search our database and find information about your engine.. - There should be an identification plateed or riveted on the blower housing flywheel shroud or on the engine cooling fin sheet metal .Wisconsin engine identification more spark! The Shade Tree Fix-it Man. Loading Unsubscribe from The . - I have a Wis/Rob side shaft engine and I 'm trying to find out what size it is. The number stamped on the block is S150-025237. I 'm putting it on a .