Oil biuld up on exhaust

Kind of hard not to get some oil around the end of the exhaust opening even at high dilutions. The higher the RPMs you ride at, the less you'll have of build up. I am always putting around on single track, so I usually have some burnt oil collected on the exhaust tip at the end of each ride. If you have a lot of it, you might be running too rich an oil mixture or just have some rich jetting in the carb.