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    1974 mercury 500 , half throttle/under load problem

    1974 mercury 500 , half throttle/under load problem August 25th, 2015, 02:52 PM At about half throttle under load motor misses terrible then takes a few seconds but then clears up &takes off like a brand new motor. Runs great at idle and full throttle. Rebuilt fuel pump twice had floats off...
  2. R

    1974 mercury 500 , half throttle/under load problem

    At about half throttle under load motor misses terrible then takes a few seconds but then clears up &takes off like a brand new motor. Runs great at idle and full throttle. Rebuilt fuel pump twice had floats off twice cleaned readjusted per secs new gaskets tore both carbs off soaked and...
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