RE: YS 160 v OS 160
The YS engines need 30% nitro fuel to run properly, so, it results in a very expensive engine, if you use a lower nitro content fuel, you will have idle and transition problems besides of lack of power. Regarding YS service and technical support, in my personal experience, it is very deficient. I have had very bad experience with the YS technical support (YS performance). I lost my money by purchasing a YS engine that never ran properly from the beginning, YS Performance did not repaired my engine, they do not honor the warranty compromise. I do not recommend YS engines, I think that OS is by far a better option.