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9.9 1987 4 stroke

mpknls

Member
Ok got to take my boat out the othere day all good at half throttle. When i open it up smokes like a 2 stroke. Only not oil smoke smells like sulfur kinda a black or dark gray smoke. I ran it hard thought it might clear out it didnt. Checked the oil when i was done did not burn a drop. Any thoughts
 
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