'78 CB750F SS
So, I fix one thing and more problems pop up after running fine for a year, and it all started by tightening the boots from the air box to the carbs. This time it resulted in me needing to pull the carbs to clean and hopefully fix an overflow problem. I have taken them apart and cleaned them, and replaced a failed gasket on #2. I'm putting them back together and find that 2 screw holes on the #2 and 1 on #4 are stripped. One of the ones on #2 threads, but won't tighten all the way it's just spins, the second on #2 isn't catching any thread at all. I knew #4 was tapped to a bigger size, but if i have to patch 2 I might as well do a 3rd. What can I do to keep all the screws the same size and not have to tap to a larger size? Also 2 of the holes (one on #2 and one on #4) don't go all the way through the carb body, they are blocked by the backing plate screws.