I've been running an OS.40 FP in my ARTF Nobler for a couple of years now. Like yours, mine was an r/c engine, I bought the NVA and venturi ( same as the LA part ) from my LHS. I'm a big fan of the FP series engines for C/L, also got some .15's and a .25, all converted from r/c to C/L. They're good engines, you'll be happy with your FP.40.