what is the real big deal with gas conversions. I will tell you why, the 2 reasons are inexpensive fuel and no gooey mess. Here is what you do, take your ryobi get a glow plug adapter and a alcohol carb from ch ign. with a converted engine on 0% fuel only 2.80 a gallon you get more power and loose the weight and still no gooey mess because you have bearings on the rod.

simply put no mess,low fuel cost,less weight only 2 lbs., runs cooler and more power to boot.

check here for more info

http://www.rcuniverse.com/forum/m_61.../tm.htm#613466