John :I never saw a K & B with a bulge in front for a bearing , it has a BB ,not a real big one like now days but a bearing. The early carbs had the arm held on with a Phillips screw, later had the nut like he has . Picture is not too good ,but looks like K & B logo on side, early carb had aluminum idle disk later was brass, early took a small black needle with a spring to hold adjustment later one had a brass one with an "O" ring inside it. Never saw a pressure carb with the aluminum disk, came later with newer brass barrel carb. Had a couple of plain bearing engines like you are talking about but they had a shinny finish & a much different thrust washer , a throw back to the old "Green Head". Apapa, you may not be able to find a good muffler for it any way so it may not be usable, don`t know about noise up there? Any way like the rest of the troops say best find a club & some help.>big max 1935>>