PM T2, wow, cool. I have not seen that. I guess what I meant was on the K and A motors, must have been on 50’s also then. Was the Ree-Coil aftermarket or Johnson supplied?

Buccaneer, I’ll be glad to help if I can on those K motors. I also have the K-50 and a KA-10. I would like to see pics of them before being cleaned up.

Nice motors, the KS is very clean!
I do know the difference, paint! The tank is painted on the KS, as far as I know everything except the rope sheave is painted dull aluminum.
The KA-10, 1940, has a polished tank, looking at your picture it almost looks painted, is it bare or paint, mine has the wrong tank so I’m not 100% sure on that. Both your motors look very original so you should be able to compare them and see what shined up and what’s not. My KA-10 unfortunately is not as complete as yours. The decals may be different, let me know how they compare.
As far as mechanically from the KA-39 thru the KD-15 nothing really changed. KD had recoil, because it was deluxe, but same everything else.
Good luck with them, you may not need to do much more than a good points cleaning and carb cleaning.