That's all I needed. I've seen his MX port. The exhaust isn't gonna be to radical in there. I will just say that numbers aren't adding up. With 66mm pistons in a stock cylinder that doesn't have to radical of an exhaust, there should be a bit more compression. But that could all lay in the loose squish. You're definitely not getting a good burn on the race fuel. Your jetting seems a bit fat for what your combo is compared to others, and I believe it's incomplete burn. I would definitely take the timing back to +4 degrees and try 93 fuel and see if you get a better response off the bottom. And I bet the main will look a bit richer then it does now.