Ok I finally got everything I needed to make it run and put in the new spark plug, carburetor, and gas tank and set everything up. I cranked it and it ran!.... Except I'm seeing more issues. First problem: black stuff is shooting out the exhaust and it smells bad. I'm pretty sure it's just old build up that's never been cleaned out. Could that cause any problems? I tried to get the exhaust off but it's attached by springs and I could only get one off the rest feel like they're impossible to get off so if anyone knows a way that would help I would appreciate it. Next problem, it's idling very high!! As soon as I crank it, it sounds like I'm revving it almost full throttle and I cut it off because I felt like I was gonna damage it. I have no idea why it's idling so high. I didn't adjust the fuel or air screw so do you think it might be that? Let me know which ways to turn which screw to lower the idle. If it's not that then does anyone have any other suggestions on what could be the problem? Thanks in advance.