Hi, I am converting an echo cs-440 chain saw engine now, it is a 45cc engine. Very easy to work with, just unbolt it from the frame of the saw and you have your short block ready to convert. It has beam mounts cast on the crankcase for easy mounting. Brilleillicustoms.com hasthe prop hub ang the intake insulator and hardware kits at a reasonable price. He made them for the BME 50 but they bolt right on.