No engine numbers means we do not know make, model type of start enrichment. Pulling slow on auto choke B&S models can give a bit of enrichment so that the vigorous pull will fire. If primer Tecumseh then prime wait 10 seconds and prime again. This has an advantage on some B&S engines as well. If it is cold, do this 3 times or even 4. If a honda, there are MANY service bul on choke issues. Like many have said time and again, and I must reinforce cause I almost ignored this without ENGINE OR MODEL INFORMATION-- INFORMATION, otherwise all you get is a bunch of stuff not worth reading like this ramble.