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There is supposed to be an air horn drain to stop this from happening. Yours must have been plugged with dirt, or perhaps deliberately closed off in the past. Aside from bg's recommendation, which seems like the most likely explanation, there are a couple of other possibilities. If gasoline is not drip-drip-dripping from the carb, the float is probably OK. Try the no-air-tube connected brief test I mentioned earlier. It is possible that your tank had a big slug of water in it. You might consider draining off some gas into a clear gas container and letting it sit. Look for a meniscus between a water and gasoline layer. Also consider opening the fuel bowl drain to let any residual water out of the carb. One more diagnostic aid is a little starting fluid sprayed into the air horn. If the problem is fuel related, the engine should run more energetically than it does now. If you still get only a grudging couple of pops, it is more likely spark or timing issues.
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