Delco 27MT starter I assume. You need to ascertain if the plunger inside the solenoid is sticking . . . or if the contacts in the solenoid cap are pitted and sticking . . . or if the voltage going to the solenoid "S" terminal isn't being cut off. When you turn the key and power gets to the "S" terminal - an electromagnet pulls a metal plunger against a spring that pushes against a rocker-arm that puts the starter drive into the proper place. Once pushed all the way a button is pushed in that makes the copper contacts close and make the armature spin. The starter drive has no "Bendix." It uses a sprag roller clutch that acts like a one-way rachet. As another poster mentioned - if the starter drive gets stuck "engaged" - it prevents a sort of "back-feed" and keeps the power going even if the power is shut off to the solenoid. Delco direct-drive starters have a pretty weak drive-stop at the end of the armature that come off at times. So - your problem can be stuck contacts, sticking plunger, broken drive stop, etc.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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