The hour meter telling you to change the oil is normal. It is preprogrammed to tell you that every 100 hrs. As far as the exhaust "glowing", that is normal as long as it is only the header pipes coming out of the engine that are glowing. I've noticed the header pipes glowing on all of my Walkers at one time or another. The first time I ever saw it was when I was finishing up a leaf cleanup in the fall and it got dark on me. If the muffler itself is actually glowing then I'd say you've got a problem.