I arrived here after googling Star Model 49 Popcorn machine so i could figure out what the darn thing is worth. Picked one up after being told that it had "burned up."
Plugged it in and immediately noticed that the agitator was running but not turning. Tried WD-40, tried cleaning, wound up using my channel locks to force the shaft to rotate.... that did the trick. I picked up five packets of ready to pop from the hardware store because they always have popcorn there. Good stuff!
Funny how you stumble across these threads and discover how the same problems exist all over the country. Five years hence, some other poor slob will be trying to figure out a problem with a popcorn maker and find the two of us here, asking and answering our own questions. Do you think it's something in the popcorn?