First of all, I want to thank everyone who has posted a reply so far. Each message has provided some great information.

I recently bought a GP Gene Soucy Extra 300. I built it with the hopes of putting my YS 110 in it. However, as powerful as the YS 110 is for a glow engine, it turned out to be lack luster at at best for a plane of that weight. I kind of knew the YS 110 would be inadequate because I was hoping to move up to gas. It looks like I'll be moving up to gas faster than I thought. This plane is around 13 pounds, so I'm thinking of an engine around the 45-50cc range.

Several people have said that there are more similarities than differences when changing from glow to gas. I've found the following:

1. You need to choke the engine before starting. Some people use a separate servo to do this, which can double as a kill switch.
2. Many (not all?) gas engines have an electronic ignition. Do you mount this directly on the engine or the firewall? This requires and additional battery pack?
3. Different fuel tubing is needed so the gas doesn't destroy the glow fuel tubing.
4. I think I've seen pilots use two switches on the plane. Is one the regular switch/battery for the receiver, and the other for the ignition to the engine?
5. Most gas engines are started by flipping the prop by hand, as opposed to using and electic starter on glow.

Any other differences that I've missed? Anything above incorrect (its entirely possible). I'm hoping to find some gas planes at the airfield tomorrow. Hopefully I can talk to someone at the airfield that can show me around their gas powered plane, but all of this info is of great help.

Thanks again. Joe