Mercury 50hp 2003 - 2 strokes does not go beyond 3500rpm and 20 knots

fcoelho

Recruit
Joined
Sep 19, 2009
Messages
1
Hi all,
Any one can help me? I have a Mercury 50hp 2003 2 strokes. It works fine but when I full accelerate it it does not go beyond 3500rpm and 20knots (lack of power). I changed the entire fuel supply system, cleaned the tank and hoses, cleaned the carburators, tested the spark plugs (OK) and changed the stats. However the motor reaches 3500rpm and then does not go beyond that. At the end I do not have enogh power to reach beyond 20knots. Normally the motor goes beyond 35 knots. Another thing is that the motor does not take anyone water skiing from the water (lack of power).
Any one with any clue?
 
Last edited:

Moody Blue

Captain
Joined
May 24, 2004
Messages
3,136
Re: Mercury 50hp 2003 - 2 strokes does not go beyond 3500rpm and 20 knots

Are you saying that the motor previously ran faster with the same boat? What size/type boat is the motor on? What prop are you running?
 
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