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Compression check

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spicerak

Contributing Member
hey i checked my compression o

hey i checked my compression on a 150 evinrude 1990 they read a litlle over 90 but i did one plug at a time is that the way to do it.also the left side plugs they look like they get dried out like carbon on them or something what do u think.no metal or anything.the right side plugs have like a little oil on them that looks good to me.thanks for the help
 
"not bad,at least they are eve

"not bad,at least they are even,...u need to do a tune up by the book,and 'de-carb' that eng,using a mfg decarb for outboards,or deepcreep from auto parts.."
 
You should remove all the plug

You should remove all the plugs and ground out the wires to do a compression check properly. If not the compression of other cylinders will affect the reading you get for the one being tested.
 
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