11 Brute 750 was smokin quite a bit and missing real bad. Pulled rear plug and it was loaded with oil sludge. Pulled exh pipe and found oil residue. Figured it was bad valve seals. Replaced all 4 seals on the rear cyl. Used pro x seals. Re assembled and still getting lots of smoke and oil on the plug. I didn’t pull the head to put new seals in. Any advice? I can’t figure out how to post a pic.