To rebuild the carbs properly you'll need new diaphragms or you will run into full throttle issues. I've rebuilt 2 and tried everything you see online and I can tell you the best thing to do is rebuild the carbs and whatever parts you buy make sure they are genuine honda parts or you will regret it.
It isnt hard to get rid of the Airbox. I have 2 cb750's one is an 81 k four and the other is a 79 cb750f super sport. I run velocity stacks on both. All you need to do is put a stage 3 jet kit in it. I had to fine tune the k model more than the ss. You dont have to change the exhaust to run a...