Well, after 49 years Charlie ( our 1968 Sears Custom 10 XL0 has said it's time for the starter motor to go bad. I know they are a Techumse motor but I have no idea what the part number for the starter motor is. I have misplaced our manual for it and can't locate it just yet.
It may be just the bendix is dry or gone bad. The starter motor runs but doesn't engage all the time. Plus it sounds really bad. LOL!
I had to replace the fuel pump a few years ago with a B&S pump and haven't had any problems since we got it in form the wife's old home after her mom passed. Will have to keep looking for it and then hope we can find the parts to keep him running.