Yeah, I have had several YS engines up to 1.40 and I run Magnum 1.5.
I have always been told that the FAI guys cant run Nitro and it always threw me for a loop.
Didnt see how but thats what I always understood, thats why I said I dont think they can run nitro... So you are saying there are no nitro limits on FAI at any competition worldwde?? Just an interesting tidbit to know for sure...