All good suggestions. I would check the ignition battery, then remove the carb plate with the single bolt,fuel pump diaphragms, and check for dirt in the screen. If the fuel pump is blue I would change it to the black or the tan color one. While you have the carb off you can remove the backplate and check the reed block.
It's probably fuel starvation but after this if it still won't run up then the ignition box advance may be the problem.