Mercury 20 hp*1967 special problem

Louis-Phil

Recruit
Joined
May 16, 2009
Messages
5
Hi everyone!

I did rebuilt fuel and carb plus change the plugs .Compression good and equal on both cylinders, spark on both plugs. But skip firering at mid to full throtel. At idle if I unplug the spark plug only the top one will keep the engine running the lower one died few second after.

I just cant find it.
Any ideas?
 
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