HELLO... I HACE AN EXTRA 330S PHOENIX MODELS... WITH AN OS .91 FX..
THE PLANE IS A STANDARD 60-91 TWO STROKE OR 90-120 FOUR STROKE...
Wingspan: 63.8 " (1620mm)
Weight: 7.5 - 7.94lb (3.4-3.6 kg)
Length: 50.39" (1280mm)

MY CONCERN IF I CAN PUT IN A GASOLINE TWO STROKE ENGINE 24cc ON IT... ABVIOUSLY REINFORCING THE FIREWALL.. AND WORKING WITH THE CG... WHICH WILL BE MY BIGGEST TROUBLE THAT I WOULD HAVE TO DEAL SETTING AN GASOLINE ENGINE IN IT... THX..

LUIS AULAR

if you can get the cg on point u will be on gas i put a gas motor on a u can do and an omp yak (glow birds)

Weight would be the main concern. If you have to add a bunch of weight to the tail to get the CG right, then it's possible that it will change the flying characteristics of the plane. You might be disappointed. You may have the power to hover, but a 12 pound plane with a 10 pound airframe isn't going to land as slow. You can machine the engine to try to shed some weight, but I don't think it will be enough.

Everyone is over powering airplanes, I don't get it...why not put a small block V8 in it...

Hey, now that's an idea. Conley Precision Engines makes a small V-8 that just might work great. Heck it's only MONEY.