Question after 15 tanks or so...
I have it set to a normal/rich LSN, starts to load up after a bit. I have it set really rich on HSN, to where it juuuust barely clears out. Any richer and it blubbers along. Tons of good smoke throughout rpm range, never leans out or acts lean. It's just that the temps jump really quickly. It cools down to under 210 if I let it sit for a bit, then I punch it for about 50' not over-revving, turn, and WOT back, stop, and it's 257 or something, blowing tons of smoke all the way. I know that's not too bad, but I'm thinking it will continue to climb if I'm racing.
Sealed carb, backplate, no bubbles in fuel, normal throttle response, steady idle, no tank leak, no line leaks, temp consistent throughout tank fill levels.

Here's what I'm wondering.
Does using 20% cause the motor to run hotter on breakin? I'm trying to figure out how I can race, but it still gets hot really fast when I punch it. Should I switch to 30%? I'm running Sidewinder. Or, is it just that the asphalt is 160degrees and doesn't have enough of a temp difference to cool the motor no matter what I do?
Thanks for your thoughts guys!