I will be the bearer of bad news for you. Your motor was obsolete pretty much within 5 yrs of being built. You need to find the software and correct cables for a first Gen Ficht. Parts availability is pretty much non existent. Good luck even finding a Mechanic to look at it. When BRP bought OMC...
Pull a 63 and 64 Evinrude apart and tell me the differences? My 1958 Scott 60 hp has the exact same bearings/block as my 68 McCuolloch 75 hp. Why is the McCulloch capable of 100-1 and the Scott is 40-1. It is because of the oil not the Metullargy.
Easiest way to build those pumps, is put 2 screws in a vice long enough to go through the unthreaded part. Build the pump on those 2 screws and stack it like a sandwich.
I think the takeaway from this is to know what you are taking apart. Don't just jump willy nilly into it. A lot of those pumps get rebuilt just need to be aware of what's in it. Google has many parts breakdowns for those pumps.
Your oil looks fine. Use 80w 90 marine lube for the lower unit. Use hand impact to get the lower screw out if it is to tight. Maybe replace the screw while it is out.
That is also an old wives tale. When Evinrude went to 50-1 in 1964 they did not re engineer the whole line. Just changed the oil. When they went to the E-tec, they used the existing 60 degree block.
I can pretty much guarantee you are not idling at 25 degrees. Look to make sure the carbs are opening all the way. Do a spark test and compression test. if they put CDI parts on, a thorough test of those are in order.
