For the past month or so I have had trouble starting my bike from one weekend to another. I will ride at times on both saturday and sunday. It has been extremely cold in the mornings and warms up a little in the afternoon. When I get ready to start the bike I will have to kick several times trying to get it to start it might start for a second and die. Then I start kicking again several times until I decide to try and put a new plug in. When I pull the plug the tip is covered in carbon and a little wet. Once I put the new plug in it starts on the first kick. So after putting the new plug in I won't have a problem the rest of the weekend. Until next weekend It seems like I go through the same thing all over again sometimes I can get it to start. I'm still running the stock jetting and haven't had this problem until it started getting cold out. I would like to know what I can do to solve this problem.