Got a 1983 Evinrude 70 thats been giving me some trouble. Had an issue with rough starting and rough idle for awhile now and I have definitely narrowed it down to an issue with the spark but that's about it. Also probably not the coils or powerpack. Anyway after sitting overnight or until it gets cold the spark is gone, if you start messing with it and crank it over for awhile the spark comes back on a few cylinders and you can get it started but it will not run at idle you have to rev it up to keep it running. Only way to get it to run is to open it where it will run fine at 4500 rpm all day, getting it on plane is tricky though it will not rev up immediately, runs real rough for a while struggling to get over 2500 rpm but then like a switch is flicked it clears its throat and you're good until you shut it off again. Should also mention it leaves quite a trail of smoke when it comes back to life. Pumping the primer bulb has no effect and pumping the primer solenoid makes it want to die like if you were to choke it out.
So far I have checked compression 115 across all cylinders, soaked and rebuilt all carbs, cleaned and inspected fuel pump and lines (fuel pump and lines are 3 years old) replaced the power pack and swapped coils to no avail. Grounds and bulb have been cleaned. Removed the temp sender alarm thinking it was putting it in slow mode. Also tried to run it with the box disconnected to rule out anything in the box. I am using a gap spark tester and inline spark tester to confirm no spark. Timing light wont pick it up either when its acting up.
Any help would be appreciated this thing is driving me mad, would like to have it running for the 4th tomorrow too no pressure haha.
So far I have checked compression 115 across all cylinders, soaked and rebuilt all carbs, cleaned and inspected fuel pump and lines (fuel pump and lines are 3 years old) replaced the power pack and swapped coils to no avail. Grounds and bulb have been cleaned. Removed the temp sender alarm thinking it was putting it in slow mode. Also tried to run it with the box disconnected to rule out anything in the box. I am using a gap spark tester and inline spark tester to confirm no spark. Timing light wont pick it up either when its acting up.
Any help would be appreciated this thing is driving me mad, would like to have it running for the 4th tomorrow too no pressure haha.