My 200 has not been the runner that I had hoped. 3 gallons thru and got tuned what I thought was great. 15 dead stick landings later all less than 1/3 tank and much less and now it won't even start. I can prime and run on the prime but no gas from the carb. Cleaned the screen and inspected diaphrams Soft and Pliable with same results. I'm stumped!