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Backfiring


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Fuel flow disrupted to bowls. Its running out of fuel and it slowly refill them over time. Make sure you actually have fuel flow. A clear hose hooked to the drain and held up will easily show if it does or doesn't have flow when running.

 

Turn the hose up and use it like a sight glass for the fuel level right.

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Replace with a new piece, can't hurt. When you rebuilt carbs and did tors delete, did you clean jets  and screw them all the way in snuggly?  Run those air screws in all the way, then back out 1/2 turn for testing. This should give it more fuel.  I'm assuming the  engine passed leakdown

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