Mercury 2000 75hp 2 stroke "bogging down at high speeds"

[Blackwater25]

Hi guys,

I have a Mercury 2000 75hp 2 stroke that seems to be having fuel problems and hoped to get some insight as to what may be the problem. To start with the boat idles a little shakey and sounds like it could be back firing every few minutes. Coming out of the hole seems normal but when I get to about 2500 rpms or 20 mph the engine starts bogging down. When I push the throttle down when is starts to bog nothing happens and seems to be starving for fuel and the boat slows down.

I'm not a boat mechanic by any means but it seems like it could be a dirty fuel filter, a clog in the gas line or a clogged high speed jet? I don't believe its a clogged gas line, at least to the blub because is stays hard, seems more like a problem after the bulb. I have tried Sea Foam already.

Any ideas where to start??

Thanks in advance!

 

[CharlieB]

Re: Mercury 2000 75hp 2 stroke "bogging down at high speeds"

Bogging/back firing on acceleration is usually a sign of a 'lean fuel' condition.

This can be caused by a dirty carb, then the backfiring symptom causes a ruptured diaphragm in the fuel pump.

Rebuilding the fuel pump without cleaning the carb may just repeat the fuel pump problem.

 

[Blackwater25]

Re: Mercury 2000 75hp 2 stroke "bogging down at high speeds"

Thanks!