Hilborn Technical Support - Electronic - Fuel Injector Manifolds
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Popping out of the exhaust

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Popping out of the exhaust is typically related to a rich condition. Typically, popping will occur at a higher rpm after wide open throttle. Adjustments will be made to the FC and MC pot at the 8000 rpm location. Since this condition is an indication of being rich you will turn the adjustment pot to a lower number. It is important to note that only small adjustments are necessary. Also, please see "Tuning By Percentage Of Throttle Opening" page of the Tuning Manual for definitions of the FC and MC circuits.