2001 mercury 15hp four stroke dropping a cylinder

norman2013

Petty Officer 2nd Class
Joined
Dec 8, 2013
Messages
154
I have a mercury 15 hp four stroke 2001 15elh4st
The motor will start right up run good for about 15-30 seconds then drop the top cylinder and eventually will stall out.
So far it’s got good compression, cleaned carb, and did a spark test. Any ideas guys?
 
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