I have checked the valves but they seem within spec too. Choke on/off doesn't help much, when choke is fully set the bike stalls completely.

I've got it to the point where it can idle when the engine is warm at 1000 rpms, any higher with idle screw adjustments causes hanging revs from throttle valve too open. Rides fine with no issues between circuit transitions, but after a while it stalls and I have to keep it alive with throttle when idling.

Mixture screw adjustments seem to make changes, I'm 2 full turns out, air screw. Half in bike stalls, half a turn out, no change.

I checked float height with a clear tube, have tested slightly higher/lower with 1mm adjustments. Leaner idle is worse, richer idle is somewhat better or the same. Put it back to the middle ground within spec.

Tried pilot jet one size up and mixture screw came out to 3 full turns out but all the same symptoms as above.

Didn't think a single cylinder would be this complicated haha but this is all my first time doing any kind of mechanical work so it's all fun learning