I on my 4th year of using the negative-draft kit with a 4100 and suddenly this morning the fire went out. I started it back up and noticed that the corn seems to be feeding more erratic than normal. The auger sounds normal and corn does drop out but it will go several cycles with nothing falling out. Then a few cycles will look normal. I've got the feed knob turned up to 8 but its only burning like it does when I usually have it at 2. I haven't done any auger maintenance before other than using graphite every year. Any ideas?

i also run corn and find that erratic feed rate is usualy caused by by fines /dust grit ect in and around feed auger and tube i empty corn bin vacumn out around auger and firebox tube and restart

What sawdust29 says. mdcornburner When you use graphite do you dust the auger bearing heavily? I would sure look up tube for something on end of auger or in chute. As for auger bearing if you run it out of corn you can take a pcv tube and direct graphite behind the flute at right time of rotation. We got our stoves same time it sounds. I be watching mine for same problem but I am using pellets.

Thanks for the replies. Tfgrower, I just add powdered graphite from the top as the augur turns. I'm not sure about the bearing. I'll try that tube behind the flute tip the next time I add the graphite. I tried 3 different kinds of pellets but didn't like any of them so I'm back to the corn. Pellets were too messy and too much ash and some of them were too long. Thanks again for the tips.