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Old 08-30-2011, 07:33 PM
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If it spins over easily but won't fire, it's probably vapor lock. If it hesitates to spin over, it's probably an electrical problem - like too small a battery cable.
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Old 08-31-2011, 02:05 AM
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What carb/s do you have?

Sounds more like fuel percolation.
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Old 08-31-2011, 03:47 AM
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We need a little more info to diagnose. Are you running a mechanical or electrical fuel pump?
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Old 08-31-2011, 03:55 AM
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Does it help if you turn it over without touching the throttle, and when you hear it just start to catch slightly (might be 10 seconds of cranking), just give it a touch on the accelerator pedal?
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