Also, to new guys gas and glow are the same, but just to clarify, they aren't. If you went to another forum asking about a 40 gas engine, the guys that have been around would be wondering why you'd want a 40cc engine in a small trainer. :P

Glow fuel is the pink stuff that most small glow engines are run on. Gas is the stuff you run 2 stroke gassers on (weedeater engines essentially) and are usually used in 50cc or higher engines.