I have been running 40:1 now for a while with regular ethanol free pump gas and red armor oil.
My echo saws smoke a little bit more if I let them idle for say 20 seconds or more then I get back on the throttle.
Biggest change I noticed is the 60cc echo pops on the first pull most of the time and if I'm quick I can get the 40cc saw to start on the first pull. They never did that with 50:1 and I have had the 40cc echo for 12 years and the 60cc echo for 6 years.
My echo saws smoke a little bit more if I let them idle for say 20 seconds or more then I get back on the throttle.
Biggest change I noticed is the 60cc echo pops on the first pull most of the time and if I'm quick I can get the 40cc saw to start on the first pull. They never did that with 50:1 and I have had the 40cc echo for 12 years and the 60cc echo for 6 years.