Background. 2018 KTM 500. Bought this bike a couple weeks ago with 150 miles on it. Appears to be basically brand new and perfect. Spent the last two weeks getting it set up and went on first real ride this weekend. Got finished with the ride and I have classic signs of countershaft seal leak. Black chain, oily black gunk on motor case, shift lever, and everything else in close proximity to front sprocket. It’s been cleaned up in pictures below. It’s obvious previous owner never took front sprocket off as I just broke the yellow seal on countershaft bolt. When I pulled things apart all bearings and seals look fine, but the front of the plastic chain guide has been destroyed. The tab on the front of it was behind sprocket and is getting chewed up. Anyone got any ideas what’s going on here? Or what the path to resolving this problem might be?