Hi Dave,
First of all a big welcome! I am a die-hard YS-fan - it's great to see you guys here for support. YS information has always been hardest to find!
Do you know the differences between the new YS-120FZ and the older 120SCs? I know SCs are heavier (950g vs. 880g), but my SC seem to out-run both my other FZs by 600RPMs on the same prop. Is this true or did I just get a super one? Any other differences you know of?
While on the subject, can you post the power ratings of all YS engines as a comparison?
Many thanks,
Matt