I catch crap for this every time but I use amsoil saber at 80:1 and e free Sunoco gas. Been running since 2016 haven’t had a failure yet. Plus it has a built in stabilizer so I never really worry about how long it’s in the can. Buy all means you can run it at 50:1 also but it’s rated at 100:1 I just don’t have the balls to run it there. All my saws have very minimal carbon build up and cranks have not been an issues at all. Only saws I do t run at this mix is my ported 395. It would probably be fine but just going off the builders recommendations I have not run it at this ratio.