RE: YS61 2 Stroke w/ Jett-Stream Muffler
Hi David,
Thanks for writing.......
I flew a few YS engines back in the day. Always good powerplants. Unless you go out of your way .... you will not hurt the engine. You already know the drill regarding after-run oil in the YS.
The engine you have works great with 12x10, 12x12 props. In an older design aircraft, you may have to drop to an 11x10 or 11x11 for ground clearance.
With the jettstream, any of those props will work quite well.
The 20-20 fuel will work fine. I ran mine on standard 15% omega most of the time. A bit more nitro will not hurt it.
Word of caution - keep in mind the YS61 engines are physically larger and sorta heavy compared to the ST blue head or Webra black head , or even OS 60 FSR from back in the day. Plan your engine installation well in advance and accordingly.
Let me know things go when you get to testing props on the test stand.
Bob