RE: !/4 scale WWI kits?
Abu, For my Mick Reeves Camel I have a Laser 200. That should be plenty of power.
The 1/4 scale WWI planes don't require much power as the full sized planes had small power plants. My SE5a that weighs 17.5 lbs is flew with an OS 120. I did re-engine the plane with a Saito 150 due to cooling issues.
Think of Saito 325 for a radial. One of my friends flies them and they work grest.