Pilots,
believe it or not-small head engines WILL work on a Byron fan set up-I have run Rossi and OS engines with small cyl.heads-and they DID NOT overheat-you just have to make sure that you do not run them too lean.Use a on board mixture control. and contrary to what some people have said-the Rossi df engines are very,very good-you just have to know HOW to set them up and run them right.What I do with any DF engine I have is-take it completely apart-check it for F.O.-then make sure the front and rear bearings are "seated" properly-this step alone can give you a extra 1000 rpm-use red Locktite on all the case and carb. bolts-blue Locktite on the cylinder head bolts.If you don't like the Rossi carb-you can adapt a OS.91 carb to the Rossi engine-makes a great engine even better.I use Powermaster 15% with a extra 6ozs. of castor oil and 2 ozs. of Exxon 2380 turbine added.My engines run great.

Jackjet