I have an 81 sporty. It has 1.75" drag pipes and an s&s super E carb with s&s air cleaner. When I give the bike gas it puffs rich smelling black exhaust. I've adjusted and adjusted the carb but can't get rid of the problem. What would cause this? Also since I've owned the bike it's been spraying oil all over the back tire and back brake. I replaced the mainshaft in the tranny. I've replaced the front drive gear oil seal 3 times, and nothing helps. And it always marks its territory where ever I stop. What would cause this?