Yes, I know when an engine is peaking, I use a tachometer for that. However, I thought that this engine would be close to the OS 46FX/AX in terms of needle settings since it is almost the same size. Thats not the case though, the high speed needle on the 46FX is at 3/4 for peak rpm while its probably at 1 1/3 for the 55AX.

I guess this illustrates just how different the 46FX/AX is to the 55AX. The power on 55AX is amazing.