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Has anyone had a problem with a tractor popping back through the intake. But there is nothing wrong with its head? The card has been rebuilt, professionally. Everything in it is new. New plugs and wires. Put a new coil on it. No new points or condenser, new fuel pump.
 

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Verify that the firing order is correct, and then, remove the valve cover and make sure all the exhaust valves are moving all the way. If not, you have a flat cam lobe.
 
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