Thanks w8ye,
I have learned a lot from your post over the last 3 or 4 years. I have read everything on RCU about Evolution and MVVS gas engines and it seems like the 58cc has the most problems. Sometimes I wish I had waited for the MVVS LE 58cc, but my Evolution 45cc has been a great engine, the only problem I had was the muffler bolts, but that was an easy fix. I have always wondered if MVVS goes a little extra on their engines. I have a MVVS 26 and the Evolution 26 that seem to run the same in my Sundowner, although I have not run the MVVS as much as the Evolution. When the Evolution 58 is awsome when it is running right. This is the last video before it started acting up.

http://www.youtube.com/watch?v=5YbgD7Hx-vw