Re: Need more speed
just somethin to check but my my boat has a 5.0 merc inboard (soon to be a 5.7)with a 21p prop and i top out now at 54 mph at 4600rpm now after replacing my coil...it was weak and going out....i had no secondary voltage before replacing it i could barely turn 3800 rpm and achieve maybe 35mph or so at WOT.....may not be your problem but it was mine just thought id post....and are u triming up correctly? u might not be getting enough of the boat out of the water..
just somethin to check but my my boat has a 5.0 merc inboard (soon to be a 5.7)with a 21p prop and i top out now at 54 mph at 4600rpm now after replacing my coil...it was weak and going out....i had no secondary voltage before replacing it i could barely turn 3800 rpm and achieve maybe 35mph or so at WOT.....may not be your problem but it was mine just thought id post....and are u triming up correctly? u might not be getting enough of the boat out of the water..