Hi guys, I am about finished with my first kit, a Sig LT 40. I need some advice on engine choices. My LHS suggested that I put in a .46. I looked at tower hobbies and such sites as those and I am a little confused as to which model to get. I know it should be ball bearings for the crank shaft.

How about ABC vs ringed. And what does FX, LA, FS stand for. I want an engine that I don't have to modify the fuse to get to the needle valve.

I also want this engine to be able to up grade to the next step i.e low wing sport type. How big should I go. Any suggestions would be helpful. I would like to by from my LHS as it is a mom pop establishment and I support the little guys.