BP-1 Diaphragms
I'm not sure if this will help, but I can make two of the diaphragms for the BP-1 if they are what you need. My BP-1 had a good fuel pump diaphragm (the one on top), but the regulator diaphragms were too dried up to be used. I made new ones out of some thin Nitrile sheeting, with the center discs glued on with fuelproof glue, and they still work great after being immersed in gas for about 8 months now. Other things to pay attention to on the BP-1 Carb. are the primer check ball seat (rubber), and the condition of the fuel pump gaskets and mating surfaces. Once you get the fuel pump to prime, and have good regulator diaphragms, they seem to start and run pretty good. I'll lay $50 down that mine will start cold on the first or second pull, it's that good. One hell of a saw! Too bad they are so scarce, I'd like to have one to use for an everyday saw.
Let me know if you need the diaphragms...
Brett Phillips