While we're on this topic
I'm currently flying an LT-40 with an OS FX 46.
I am going to build (kit) a Sig 4*60 over the winter. The most recommended engine is a Saito .91 (4 stroke).
I just want to understand what I am going to need different for the 4 stroke engine.
I.e., Is the fuel different.
Does it need oil (and how does that work).
If there is some sort of FAQ or something out there, feel free to route me to it.
GB