So I finally got the Express running, it was to rich so we added more gas last night and it was running fine. This morning I went to fire it up and rode it and got about a block and it died. I kept kick starting it and it was running but would die if I gave it too much gas. I kept doing this for a while hoping that the engine just needed to warm up. Then I pulled the spark plug to check it, it was a little light colored so I figured I was running a little lean. I put the spark plug back in and when I went to start it it make a really weird noise and the wheel would lock up. So I went to bring it home and I started walking it home and without the motor running I walked it home and the wheel would lock up and make the crazy noise from the engine. I'm not really sure what to do. Did I seize the engine?
Any help would be great, sorr for such a long explanation.