06-20-2021, 09:09 PM
Low speed should be enlarged to .048 and the high at .042 (these are the orfice holes). The holes under the welsh are fine. I do drill out the holes in the floor of the carb where fuel feeds the needles to 1/8" gas or alky (however you don't need to for gas). Do not confuse these with the actual needle holes that are the orfice at the needle tip. I raise the fulcrum arm to about .030 for a starter setting. The dump tube as we will call it is fine with the check ball or the flat plate as it comes for gas. I replace the throttle shaft with the 13-1592 tillotson part. If you have a carb that has one shaft side that is tight I have taken a drill bit that is correct on the the other side and put it in the drill and turned it backward with sandpaper wrapped around it to remove the sharpness of the flutes so it acts as a ream instead of a drill. These carbs are perfect every time when this is done.