Re: 1960 40hp johnson super seahorse?
1) That motor can be started with no wiring harness connected to it at all. But you'll have to choke it to death to kill it. I had one. I had three good pulls in me, then I ran out of steam. They don't pull start very easily, but they do start with the rope.<br /><br />2) There is a transom mounted electrical box with a main harness to the motor and a harness to the dash, plus battery cables. The starter solenoid is in there. They're fairly common and were used on Johnsons, Evinrudes, and Sea Kings in the 35Hp to 40Hp sizes from about 1959 to 1963 or so. Try ebay or Twin City Outboard if you can't find one locally.<br /><br />3) Select parts are readily available. Whether it's worth fixing depends mostly on the condition of the powerhead and the gearcase. If you have to spend more than a couple hundred on parts, it ain't worth it.<br /><br />4) Compression should be somewhere between 90 and 110. Point gap is .020", sparkplug gap is .030", You can run it on 50:1.<br /><br />5) If the coils are original, they'll need to be replaced by now. The plastic around them decays over time and cracks. They're about $24 each. <br /><br />6) The gearshifting was crude and the mating surfaces of the shifter and gear round off making them pop out of gear. The gearcase parts are quite expensive if they are still available, and used ones will probably have the same wear problem. There were newer updated parts available that helped alot with that problem. If you're lucky, maybe yours has the updated parts. If the gearcase problem exists on that, I'd about abandon the idea of making it go again. But they're strong runners and good starters when everything is right.