'79 MAKO INBOARD
New member
I've got a '79 23' Mako with a '99 Marine Power 350 Vortec. It's new to me, and runs great except I can't hit max RPMs, supposed to be 4400-4600. Max right now is 26kt @ 3500. That's with me and my 160lb 17 year old son, half tanks of fuel, say 40 gallons total. I'm only a few pounds heavier than my son.
I'm guessing the motor should be putting out 320HP at 4600, but since I'm 1000 RPM down from that there's no way to know for sure. This is under load I should add. In neutral I can hit the mark easy. I'm playing with props, but it's not as easy as it used to be to find samples to try. Right now I'm spinning a 3 blade 13 X 12, bronze Federal. One other thing is that if I advance the throttle beyond 3500 I the engine starts bogging slightly and RPMs drop slightly. There's a good inch and a half of room in the throttle play still to go, but with no response.
Any ideas? I'm new to this forum so any help is much appreciated!
I'm guessing the motor should be putting out 320HP at 4600, but since I'm 1000 RPM down from that there's no way to know for sure. This is under load I should add. In neutral I can hit the mark easy. I'm playing with props, but it's not as easy as it used to be to find samples to try. Right now I'm spinning a 3 blade 13 X 12, bronze Federal. One other thing is that if I advance the throttle beyond 3500 I the engine starts bogging slightly and RPMs drop slightly. There's a good inch and a half of room in the throttle play still to go, but with no response.
Any ideas? I'm new to this forum so any help is much appreciated!