'88 merc 45 horse low power @top end

F

fastfred2818

Recruit
Joined
Sep 11, 2012
Messages
4
I have a 1988 Bass Tracker 17' w classic fifty 45 horse motor. Runs normal @ slow speeds but at wot will only turn 4000 rpms at about 28 mph. Will not completely plane out. Feels as if carbs aren't opening completely. Have cleaned fuel system completely, rebuild carbs and fuel pump. Motor will rev above 5000 in driveway but not under load. Any suggestions?
 
D

Dave1027

Lieutenant Junior Grade
Joined
May 25, 2010
Messages
1,083
Re: '88 merc 45 horse low power @top end

fastfred2818 said:
I have a 1988 Bass Tracker 17' w classic fifty 45 horse motor. Runs normal @ slow speeds but at wot will only turn 4000 rpms at about 28 mph. Will not completely plane out. Feels as if carbs aren't opening completely. Have cleaned fuel system completely, rebuild carbs and fuel pump. Motor will rev above 5000 in driveway but not under load. Any suggestions?
Click to expand...
That's kind of a small motor for that size boat. Was it ever any faster? What size prop is on it.
 
F

fastfred2818

Recruit
Joined
Sep 11, 2012
Messages
4
Re: '88 merc 45 horse low power @top end

Boat just recently purchased. Motor is original. Don't know size of prop but it is 14p.
 
F

fastfred2818

Recruit
Joined
Sep 11, 2012
Messages
4
Re: '88 merc 45 horse low power @top end

I realize with this motor the boat will probably not do much better in speed dept. but what bothers me is the fact that it will not over 4000 rpm under load.
 
Faztbullet

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: '88 merc 45 horse low power @top end

Sound like it only running on 3 of the 4 cylinders, check your spark....
 
M

mikeymike76

Cadet
Joined
May 12, 2013
Messages
13
Re: '88 merc 45 horse low power @top end

Did you ever find a solution to your problem? Mine seems to act something like you are describing. Thanks
 
You must log in or register to reply here.
Top