How old is the fuel in the gas tank? Try pouring a small amount 1 to 2 oz of fresh gas in the carb and see if she fires for a quick couple of seconds. Or a few squirts of starting fluid.
Also, fuel filter replaced as part of all this work?
Is the choke working on the carb?
You say you went to leave and gave it throttle and it fell on its face. Sounds like the accelerator pump on the first carb could be bad. If it ran with the old carb, put that one back on and see if it fires.
Also, fuel filter replaced as part of all this work?
Is the choke working on the carb?
You say you went to leave and gave it throttle and it fell on its face. Sounds like the accelerator pump on the first carb could be bad. If it ran with the old carb, put that one back on and see if it fires.