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Old 04-17-2009
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Capnblu Capnblu is offline
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Suck, squish, bang, push.
can motor ingest air/fuel? Yes/no
is motor creating good compression when turned over? yes/no
is there a STRONG spark across the plug? yes/no
Does the exhaust have a clear path to exit? yes/no

You need 4 yes's for it to run.
My guess is that you will find that you do not have spark in one plug, or it is going to be weak or intermittent. When the motor warms up, it gets worse, and might stop working at all. Replace the coil, if so.
Your fuel may have been contaminated, since you mentioned carb, I assume therefore that it isn't EFI. So check filters for contamination. Get new fuel. Check for fuel leaks, vacuum leaks in your fuel line are alot worse if you are trying to lift the fuel from a low location. Check hose condition, and clamps. The last thing that seems to fit your explanation, may be an obstructed exhaust.
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Why, why, why?
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