Members Northwood Posted July 22, 2007 Members Share Posted July 22, 2007 Hi all. Just have a question about low compression. I have a 70hp Evinrude 3cyl outboard. When I had it tuned up this year the mechanic said the #1 cylinder was lower than the other two...110# in #1...140# in #2/3...is this any major concern? Motor runs strong and smooth. Idle is a little shakey but not too bad.I realize eventually it may be a problem. Just don't want to get stranded somewhere. Thanks for the help...great forum Link to comment Share on other sites More sharing options...
fishinwrench Posted July 22, 2007 Share Posted July 22, 2007 I would pull the cylinder head and have a look/feel. If the score is on the intake side of the cylinder(s) you prob have a carb passage clogged that needs to be rectified before you run it anymore. If the score is on the exhaust side of the cylinder then your cooling system may be substandard. Damage to the #1 cylinder only is usually caused from overheat (farthest from the water pump, and heat rises). My recommendation is to have the cylinder, and what caused it to happen in the first place, repaired, before it gets any worse. Link to comment Share on other sites More sharing options...
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