Starter parts question
Hello all, been a while since I've posted. I had time this week to work on my bike and have finally put it back together (bought a while back as a basket case). I had to clean up the starter internals to get it to turn over for me, and have even had it running (though poorly) for a short time.
My question is what is the sleeve inside the starter around the armature? Mine seemed grooved up inside, like it had been warped and gotten extremely hot at some point. I ask because when I try to jump the starter from a 300cca lawn mower battery, I only get about a minute and a half of cranking time until the battery is dead. I can jump it from a running vehicle and actually pull down the vehicle's charging system (headlights dim really low). Seems like the starter is dragging really bad, or shorting somehow. What is the sleeve, is it supposed to be there, and should I look at buying a new starter instead of rebuilding it?