I normally load a Diesel conversion about 30% over the glow load, so in this case I'll start out with an 18x6 three blade, it should turn it in the high nines. The engine is going on a H9 UltraStik Lite. I have two of the early C1 MDS carbs that work very well, the C2 carbs are 10mm these are a wee bit under 9mm.