Vintage Power Kit contains all parts required to build a complete "O>K>" .049B aircraft engine plus accessories to power a model plane.  Two (2) cycle internal combustion engine Specifications BORE .420 STROKE .360 Class 1/2A DISPLACEMENT .049 Catalog number 049K.  Original box - stained, parts-instruction sheets, stickers -received from an extreme engine collector - looks new, looks to never been assembled or mounted. Please see photos