ok, I see. Basically I will then need to try and tighten the high speed needle until it stops stalling (getting flooded).

Just one more thing. Kyosho doesn't use terms like low/high speed needle, so here is what I assume now, please correct me if I am wrong, as I might end up tweaking something different:

Needle valve: Adjusts the amount of fuel inflow into the mixture (high speed needle?)
Idle adjustment screw: Adjusts the carbuerator opening while idling (low speed needle?)
Idle mixture screw: Adjusts volume of air and fuel in mixture (don't really know what this is, but the engine is increasing rpm when I turn it clock-wise).