Can't get Saito to keep running
At risk of stating the obvious, after the crash, did you check the fuel tank and its innards? If the clunk is jammed up against the front of the tank, or perhaps the clunk tube is off the brass fitting, or if the tank stopper came out or is loose, this could be the cause of your engine not drawing fuel.
Also, check to make sure the carb hasn't moved or come loose from its mount. If it has, it might be sucking air.
Remove the fuel line from the carb nipple. Attach a length of clean fuel line. Blow through this line while turning the hi-speed needle and make sure you get air flow when open and no air flow when you close the needle. You might have particulates inside the passages in the carb.