Thanks for your advice. I think I may have found a solution. First, I flipped one of the sprocket halves to that the stamping is on the same side. This helped a bit. But, what really helped was taking about 3 inches out of the chain. Looking at other LO206 karts, it seemed like mine was much further forward than most. also, I only took a few links out of the chain when it came out of the box. The chain is now significantly shorter and it spins like butter
We’ll see if this solves the problems at the track, fingers crossed.