I could be more helpful if I knew more history about the engine but here goes. You can drain the float bowl, make sure you have fresh gas in the tank, make sure the fuel filter is in place, and then try to start it. If not, then have someone else try to start it while you spray carb/choke cleaner directly into the carb throat (keep your face to the side). If the ignition system is right, it should start, if just briefly. If it won't contunue to run or runs poorly, what's likely happening that there is dirt between the float needle and seat or the float level is seriously misadjusted. That's causing raw gas to dump into the carb body. That hole is suppsosed to be there, it's the body drain. In that case, you will have to pull the carb apart. If it has not been rebuilt or you are not sure of its status, you might want to get a rebuild kit and go through it. Use B12 Chemtool to clean everything. The kit or service manual should have instructions. While it's not rocket science, if you have never done one then you might want to have someone who has watch over your shoulder. It's especially important to get the float level right.
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