tcalvin

I got lucky and picked up a Champion 400 blower for 30 bucks. It was frozen up but I have disassembled it and freed everything up. It is missing the Oil Cup as well as the brass fitting the Oil Cup would have screwed into. Does anyone know the thread size of the hole on the cast iron gear cover? I have some taps and it seems like 7/16 fits but then I'm not sure if its coarse or fine threaded etc.