I have a converted 30cc homelite on my sons 1/4 Busa DVIII.flies it around at half throttle.running an 18x6 black plastic dynathrust prop.the weight does the plane great justice since its a short cowl WW1 aircraft.If i remember right my 30cc weighs a little less than the homy 25 but i cant remember for sure,thats why i used it i think.82 inch WS.14.5 lbs RTF dry weight.I can hand start it on the second or third flip with stock mag ign.