h,

what fuel should i use for my s.c25? ive got 5% formila irvine is that any good?and how many time do i have to urn the needle out for a good starting point?

Usually two turns is a good starting point.

what about the fuel?

As a starting point, the fuel will not make much difference.
You will find that Nitro should make it idle a little more stable.

ok then thanks,: )

!0% nitro is a good all around fuel that will work nicely in most engines. I recently tried 15% and can't really seee any difference in performance. Its more expensive.