Re: 650 four lower end compatibility
Prop is no big deal, just change it. More important is the type of reverse lockout mechanism that each motor uses. The older style uses 2 brass cams, with a plastic spoolpiece, which pushes on a brass lever assy which in turn pushes on the reverse lockout rod.<br /><br />Newer styles have a plastic shift cam upon which the reverse rod rides. <br /><br />These 2 styles of lower units will not directly interchange, however a newer-style lower unit can be adapted to the earlier motor by cutting the shift shaft to correct length, cutting a chunk out of the middle of the spoolpiece to fit, and grinding the brass shift cams to fit the newer lower unit. Note, if I recall correctly, I had to turn the brass cams upside down to work right but it's been many years so you'd have to check that out.<br /><br />The older units, if they don't have an exaust tube, couldn't be properly adapted to the later-style motors which do have an exhaust tube. About '65 was the transition year if I remember that correctly.<br /><br />Best way is to have the 2 lower ends off to compare and go from there. But don't worry about the props, with the correct thrust washers you can fit even a modern stainless prop to the old lower units.<br /><br />HTH............ed
