Here you a nice old vintage Echo running good.I bought it off of a other site and got it running good. it's running a little rich in the video but i leaned it up just a tad so it runs a lot better then it did.
http://www.youtube.com/watch?v=HWi8nEZ1URo&feature=plcp
http://www.youtube.com/watch?v=HWi8nEZ1URo&feature=plcp