Just wanted to post final (I hope) results of motor ressurection project started some time ago. Let me be sure to say it has been a humbling experience yet a learning experience as well. This motor is a 1976 70 H.P. evinrude that most likely never ever ran properly till about 1 week ago. This motor now belongs to my neighbor after being passed down a couple of times from those who ran out of hair to pull out. This project began maybe 1 yr. ago with the motor on a test stand and not mounted on a boat. My neighbor/friends uncle gave him this motor for free if he could get it running type of situation. We both already had boats w/ running outboards so it was something to piddle with when we felt like it. We made a test stand to mount it on and went thru the carbs put it on the flusher and what do you know it fired right up. At that point we thought wow nothing to it. So my friend in thinking he had a good low hours old motor sold his good running rig so he could buy a brand new hull and trailer for this really clean old motor. Bought the boat mounted up the old 70 and drug it down to the water to find out things were not exactly what we thought they were with a little back pressure and under real running conditions. After a lot of head scratching, trouble shooting, searching around on this site, a quadzillion water trials this old motor finally, finally, finally runs as it should. Major issue #1 was fuel related and thanks to Walter Brown here on this site we got thru it and were able to move on to the next major issue. Someone here mentioned there might have been a factory recall on the carbs on this model and Mr. Brown chimed in and was kind enough to send us the actual service buletin on how to correct the problem by enlarging the orifices in the carbs. After the completion of this procedure the performance was dramatically improved enough to run the boat. Upon running the boat the next issue reared it's ugly head. For whatever reason the spark at the plugs would arc-over intermittently. After wasting a lot of time and money trying several other options someone here recommended buying NGK boots from a cycle shop so eventually after getting all the unnecessary stuff out of our system a wopping $7.50 was spent on three boots and what do you know problem solved--again thanks to knowledge found here on this site. We both had mental struggles being why should we have to use this type of boot "it was made to run with the factory boots" but hey all I can tell you is we did what was recommended and the results spoke for themselves. But yet, I still have one question pertaining to this issue of which I stumbled across some imfo that got me to pondering again. I have seen mention that cd ignitions don't like maintanence free batteries. Could an oversized mantance free battery cause some sort of over voltage issue at the plugs causing it to arc-over? As it is as stated the boat runs fine with the NGK resistor boots BUT being the curious type I still want to know why(forgive me I can't help myself) it should be necessary to use them. In closing, many thanks to all here who have helped on this project by sharing your real world(not found in any manual or book) hands on experience .
Sincerely and most gratefully yours, John D.
Sincerely and most gratefully yours, John D.
