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  1. P

    84 90hp merc hesitates, won't open up

    It starts easily and runs fine at idle. At half throttle it starts to hesitate and surge. At full throttle it will only run about 4000rpm. I have changed all six plugs and have spark, rebuilt the carbs, replaced the fuel fittings, checked all fuel lines for blockage. The compression is 90psi or...
  2. P

    Motor won't run smoothly or open up

    I have a 1986 90hp merc.The other day the motor was running great and suddenly started to bog. The plugs have been changed. There's spark at all plugs. The compression is around 90psi. I rebuilt the carbs, changed the gas line. The filter is clean. The motor starts first try, and idles smoothly...
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