I ran a webra 160 XP for some time. It is a real powerhouse much stronger than OS140 or OS160. Being a two stroke engine it lacks the grunt in the low end compared to the YS. The biggest problem I faced is that it would load up around 1/4 to 1/2 throttle and would flood and die. I tried everything including removing the pump and adding an external perry pump. The only solution was to close the low end needle almost shut but then no idle. Trade off was reliable idle and load up or no idle and good transition. Motor went back to the box and was replaced by much heavier OS160 in the plane. Now webra is up for future experimentation (I am toying the idea of an RCEXL ignition on glow fuel)