Anyone know where I can get new diaphrams for a 750 nighthawk with keihin 30mm CV carbs, found two websites, but price is WAY too steep... over $75 each, and I need all four replaced.

 

I don't know if you have found the diaphrams yet, not a whole bunch of people on here. If your still looking for the diaphrams try a ebay store called motoallparts, I bought all 4 diaphrams/air cut off valves for $65 with free shipping for my 81 cb750 custom