If the battery was completely dead I don't think you'd get it going just by solo pushing. If there was just not enough power for the starter motor but you had the warning lights etc then pushing would work - it has for me a few times (but with the help of a hill!).
It does depend what you're pushing though - if you're talking 600 single or similar, then I don't think you have a hope. Even with valve lifters and everything functioning on the engine I've never managed to bump start either of mine solo - the back wheel just locks up as soon as you drop the clutch. You need to add at least one other adult size person (or two kids!), get it moving in gear with the valve lifter in and then let go of that.
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