I am having a problem with bogging. On idle it revs just fine. When I ride, it starts heavily bogging above some rpm. The spark plug is very sooty (it's a new one). What can cause that? The carb is dialed in and starts from cold no problem. I think it's electric related somehow. Ignition coil is new, I had to buy it cause it was missing when I was restoring the bike. Here is a video with sound.