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Originally Posted by Clockwork
Turns out that the problem was that the Petcock was leaking, thus causing the engine to flood unless it was running fast enough to burn off the extra fuel.
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The only way that can happen is with a vacume operated petcock. It is possible for the diaphram to have a leak such that gas is sucked into the vacume line, thus bypassing the carb altogether. That is the ONLY way a petcock can cause the engine to run rich. ONLY WAY.
And that is a pretty rare failure. Usually a leaky diaphram will cause the vacume operated petcock valve to not open at all.