"Gents,I have a 75 merc 40 hor
"Gents,I have a 75 merc 40 horse no power under load in the driveway on the muffs all is fine makes 5000 plus rpm on the water under load will only make 2000rpm does about 5mph used to do 20ish mph
I have re-built carb,fuel pump(found bad inlet check valve)have...