I saw a few Echo 50cc chainsaw on Ebay from time to time, and yes it is the same engine as the BME 50. One of them was a brand new powerhead only for less than $200. I came close to snatching up that one, but decided it was too much trouble. I can easily buy a used but not abused G-62 for around $200 and get a CH Synchrospark Quick mount system for a little over $100. IMHO, that is a much easier conversion with the most bang for the buck. With a little work, you can easily get a G-62 to weigh less than 4lbs.