40hp Mariner/yamaha 1981 6E9 fuelling problem

davemaxi1970

Petty Officer 1st Class
Joined
Apr 3, 2005
Messages
272
Hi, due to poor running, using lots of fuel, i rebuilt both carbs and replaced the spark plugs . However no difference, fouled plugs, poor running and poor power/rpm continue. Today i pinched the fuel line to restrict fuel flow and the engine ran perfectly. any ideas?
 
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