Maybe you could just try full choke until start, then push it back in, just to see if that is what it wants. You have to experiment with your starting procedure also. Pump pedal three times. Hold pedal down. Next time try five pumps, whatever. Try different things. It may just be you don't know how to start it after sitting.
If you have tried different things, let us know so we don't ramble on. Need to know history of this and your efforts so far.
