I have been having some problems with my bike sputtering in 5th lately. I decided to take apart the carb and give it a thorough cleaning. While in the process, I noticed the intake manifold had a dirt film on it along with the carb. I cleaned the carb and put it back to my original settings since none of the other jetting changes made any difference. Upon replacing the carb, I decided to put a small amount of grease around the rubber intake hose on both sides of the carb. I also used carb cleaner to clean out the manifold from what I could reach and see. To finish this off, I cleaned and soaked my air filter. I then reasembled everything and tried to start it. After finally getting the bike started, I noticed that there was a lot of smoke coming from the exhaust pipe (mostly from where the head pipe connects to the mid pipe.) I had the bike running for about fifteen minutes, took it for a spin around the block and then let it sit idle for a few more minutes. The bike continues to smoke heavely. I did oil my cables using slick50 spray and got a little on the pipe, but I can't imagine it taking 15 minutes to burn off. What could I have done? The only thing that I can think of is that the freshly oiled air filter is sucking some of the oil into the bike and burning it off. However, no smoke or discoloration is exiting the silencer. The smoke is only comming from the joint.