150 1982 evinrude

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felkerjohn

Cadet
Joined
May 16, 2010
Messages
18
Engine runs ok. Very good compresson in all cyliders. Carbs have been taken apart and cleaned. Have not had a chance to put boat in water. However when running on the trailer i get a popping out od the exhaust. When running at 2800 on trailer. Still have some popping. What would cause this?
 
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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 150 1982 evinrude

There is a difference between popping and backfiring. When run on the trailer, the engine sounds as if it has high compression-as is indicated by a staccato firing of the plugs. Not unlike a popping sound. That's normal. You should be able to distinguish the differrence if it were backfiring-a much more violent popping. That could be an indication the engine is firing out of time.
 
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