RE: YS Engine Or ....?
Hey Frog,
Both the SAITO and YS are excellent mfrs and produce very high quality engines. We own and fly both. Most of my history has been with YS and I have never had a bad one. the .91 and the 1.20 are awesome powerhouses, (especially the FZ versions). The SAITO's have the advantage in the wt. dept. You'd be extremely well served by either. The quick answer to your original question is BUY IT.
Steve