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  1. R

    what pitch should i stsrt with

    i have a mercury 500 50 1977 going on a alumiweld 16 ft bass boat i dont know what pitch to began tuneing
  2. R

    40johson 1987 seems to be blowin out carb.

    i do a little work on 4 strokes the carbs should never have back pressure bfore sucktion. could the valve be stuck? the motor runns terrible trys to clear up but only at high rpms
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