1995 mercury 75 hp bogging down

by Jamie
(Murfreesboro tn US)

hello my name is Jamie and I have been having problems with my boat. It ran fine and all a sudden started bogging down under load. it would only pull around 2200 rpm and wouldnt plane out at all.I rebuilt the fuel pump, replaced the fuel filter and pulled the carbs and they are very clean. it ran fine for 3 days after that and running wide open one day it started to lose power. now it will only run about 3800 rpm. I replaced the spark plugs and that didn't help. the bulb stays tight and ive tried pumping bulb while running and it doesn't help.

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