In general, an internal cumbustion engine needs three things to work:
1) compression
2) spark (at the right time)
and
3) Fuel mixed with air (14/1 is a good ratio)
I assume you have compression in at least a few cycinders, so skip that.
I assume you have fuel becasue you smell fuel after trying to start it, i.e., flooded, so skip that.
So I would start by checking to see if you have spark. My favorite way to check this is to take a spark plug wire off a spark plug. I then get a piece of wood, say 12-16 inches long, and I drive a nice big nail 1/2 way through one end. Then take the spark plug wire and put it on the wide end of the nail. Then have a friend crank it while you hold the other end of the stick so that the sharp side of the nail is about 1/2 inch away from something metal in the engine bay, like the lift point. Just be sure you dont hold it near any electrical components.
When the engine cranks over, you should see a nice big blue spark arc across the air gap between the nail and the metal point you chose. If no spark, you know that is the reason it wont start. You then need to trace down the problem from there.
Hope this helps.
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