I posted the other day that my 65hp '73 evinrude is running rough at idle and even worse with load. I've checked the compression on all 3 cylinders and they're at 110 each. I also checked and all 3 plugs are putting out a spark (though I didn't check with a spark tester). To determine if it's a fuel or air issue affecting all of the cylinders rather than an issue with just one, I'm wondering if I should pull one plug at a time to see if each time I do that, a cylinder drops out. If the problem is only with one cylinder, when I pull that cyilindrs plug, I figure that I shouldn't hear a change in the engine. On the other hand, If each one drop out when I pull it's plug, then I figure that they're all probably firing the same and that the problem is before the carburetors ,and that I probably need to focus on fuel,pump and fuel line issues. Does this make sense? Is it bad for the engine to do this? If not, should I just pull the wire off of one plug at a time or should I actually pull the plug out? Thanks for the help.
