Heres 2 of my engines that ive recently done.The first one is the echo 23.6cc.all up RTF weight with prop,muff,ign,everything is 52ozs.the second onr is the stihl 27.2cc.All up weight RTF is the same as the echo.52ozs.I have a ch ign,no syncro on it.I have the stock carb on the echo i just havent changed it out to a 10mm yet,have to rebuild the carb or reset the needle and seat.Theres a thread started on the stihl 27cc with some rpm#s from mine.