While riding around the yard one time last nite, I noticed when I got inside that there was an oily substance on my left arm. It was a really fine-like oil, almost like that graphite stuff you put in cables. Any idea what this is. I also noticed that when I started moving, it felt like the right tire was trying to pull, even though it was in 2 wheel drive. It stopped after I backed up a couple of feet and never did it again. Any ideas on this too.

btw, it is a 99 scrambler 400 4by
thnks