Mercury 4hp 1980's will not idle.

UKoutboardfixer

Recruit
Joined
Jun 30, 2014
Messages
2
Hi All

I have an old Mercury 2 cylinder 4hp that is causing my some problems.

If starts up and runs at speed but just will not idle.

I have cleaned the carb out and checked the plugs etc but no real improvements.

Could it be low compression or some other wear related problem.

One thing I am not sure about is the roll of the small pipe that runs from a plate between the carb and the read valves to the bottom of the crank case. When I remove this pipe from the carb and and try to blow or suck on it I cant as it appears blocked solid.

Thanks in advance for any assistance.
 
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