If it backfires out the carb, that's generally due to too much advance in your timing.
If it back fires out the exhaust(or both exhaust and carb) it's generally either too rich or too lean.
What causes the backfire in that case is that the gas/air doesn't fully burn in a cylinder, gets exhausted out and then burns while in the exhaust manifold.
Smelling gas probably means it's too rich, but not a guarantee. Since you're dealing with innefficient burning, it could be too lean and you're smelling what didn't burn because of that.
A better indication is black smoke, is there any?
Follow other's advice on adjusting the carb, but first make sure your choke is opening properly.
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