Well guys...my next engine purchase will be a Toro 25cc. I read all about them a Home Depot. The engine has a forged crank and rod. It has high quality ball berings on crank. I checked the compression....and wow....it the highest of any small engine I cranked. Looked at the carb. It has a neat looking 2 barrel carb. Anyway...I got to convert one. I am giving the Mac 25 to my Grandson. Yup he is a top notch flyer. Lfe has been good