The Craftsman 34cc uses a Briggs Fource engine. Here's a link to the thread that shows pics of my Fource 34cc that was converted by Scott Ellingson at Brillelli. I have not run this engine yet. I am sure that Scott will make up a prop hub and mounting plate or do the wole conversion for anone who is interested.
http://www.rcuniverse.com/forum/m_46...tm.htm#4658598
The engine is quite heavy but should be just right for a WW1 type aircraft that it is destined for.
The followig link to another conversion - this time by Prop Nut - shows one being used in a Balsa USA Fokker DVII biplane that weigh's around 20lb. If you look at Prop Nut's videos of the fokker, the engine hauls it around the sky really well and sounds superb.
http://www.rcuniverse.com/forum/m_35...tm.htm#3539242
If you do a search there are quite a few threads on theBriggs 34cc here on RCU.
I notice that Sears now has 29cc and 40cc four stroke strimers. Does anyone know the manufacturer of these engines?
Maninder Sohi.