won't get up and go !!

[crash4213]

I have a 1976 evinrude 55hp mod.#55672E and i just had it rebuilt.it's on a 1977 4 winns 15 ft. boat. i have a 17in. prop on it and with 4 people in it i can't get it over 9mph, with 2 people in it it will go 27mph. what wasn't bought new for it was rebuilt. i was told with a 15in. prop it has to mutch rpm's but it will get up and go with 4 people but the rpm's will be to high. is this motor to small for this boat or did the people i had fix it do somthing wrong ?? please help !!

 

[JB]

Re: won't get up and go !!

What rpm are we talking about here, crash?<br /><br />Sounds to me more like an engine trouble than a wrong prop, but not knowing the rpm makes anything a wild guess.

 

[crash4213]

Re: won't get up and go !!

don't know the rpm's he never told me he just said with the 15 in. prop it will run to high rpm's with 2 people in it and with 4 people it would b ok. it ran better last year befor it brofk down with the 15in prop. it did 29mph then.even with 4 people now it won't thay put new fuel pump new stager new head new rods new pistond and thay hoe to bore out the heads for the pistons 30 over, rebuilt the carbs . thay did everything. what i want to know is this 55hp to small for the 15ft. tryhull ??

 

[Rancherlee]

Re: won't get up and go !!

I would get a tach and see what kind of RPM's your turning. I have a 55hp Johnson with the stock OMC 11 3/4 X 17 prop on my 16' Lund (rated for a 75hp) and I run 30mph with 2 people in the boat but really have issues planing with 4 people in the boat where it takes 12-13mph to get on top of the water. It takes a good 15 second to get up on top of the water where I'm limited to only 10-11mph with 4 people until I finally get on top of the water and cruise at 25mph with 4 people. I don't have a tach either but I do have one on the way along with a new Hustler Hub, 11 3/4x17, and 12x15 wheels to try on my boat since I dinged up the stock OMC prop last week <br /><br />Your 55hp should be running 5500rpm for peak power.