Hi folks
Just too throw my two pence worth in.
I have recently bought a webra 80 for an MK skystar 90. It looks a very well made engine but I am a webra fan as I use them in my helis and they have NEVER let me down and proved to be real sweeties to operate.

According to a German gentleman who has extensive experience of the Webra.
It will pull as good as a YS91 but the OS 91 fx has the edge on it but only just.
People seem to be having mixed results with the OS. Some swear by it, some swear at it.

And if you are wondering why I didn't go for a YS
two reasons
1) I live in the UK and high Nitro fuel which is the staple diet of a YS costs the earth over here.
2) 4 strokes and me just dont see eye to eye. and by all accounts anything that needs constant tweaking and a yearly refit is not for me. I like to fly not fiddle.


Mike