Thank you all very much for your replies,

Here in my country, I hardly saw anyone using 10% or 20% nitro, some I had the idea were using when I used to goto the other flying field. Here me and my friend they are all using 80%methanol 20% castor oil in all our engines. We are all using 2 stroke engines, and I'd probably gonna buy ASP .61 size, which is in my future list, or MDS .61. as soon as I get on job, one from a bank other from an insurance company. Anyway, Either ringed or bushings, both engines have the same performance, but why is it said that O.S.'s L.A. series is less powerfull than FX or AX series?

Mody