I did try removing the air filter completely and had the same result. What more does the choke do other than blocking the opening then allow full flow when off? I have tried with choke on, its starts, will idle short time die. When I try to restart with choke off it will start then die. After this most of the time then I have to pedal fast with throttle wide open to get it to run will run short time then die. With fuel coming out the exhaust. I purchased this from original owner 84 year old lady that stopped riding it years ago and has set. I't doesn't look like the main jet has been drilled but I may purchase several different sizes to play with.
Thanks for the help.