I think the new generation 2 strokes (AX series) operate at a lower RPM than the old style 2 strokes. This allows the biger props for larger "wash" which is better for 3D. I know the 120AX is rated at 9000 RPM. That's very similar to 4 strokes. I'm guessing the engines are becoming similar. The 4 strokes are turning more RPM. Maybe we should call all the new generation engines 3 strokes.

Me...I don't think any engine will compete with the YS110 in it's class. At least when it runs. Which is most of the time, unless it doesn't.

Thanks
Barry