frankconley
ArboristSite Member
Hi, I bought another jonsereds 621. The guy I bought it off said if I have any trouble let him know. He is a chainsaw guy. Works on them a lot and uses them every day. Mine wouldn't idle. He said it was because I poured out his 6 month old gas, which it ran fine on, that was 50 to one sthil ultra and put in fresh no ethanol with stihl 40 to 1. We raised the idle and it kept running. We poured out my gas and put his fresh 50 to 1 in. Then it idled too fast. We lowered the idle back almost where we started from and it is fine. My question is could the oil mix do all that? Thanks for any responses. Also is it ok to use 50 to 1? The original spec I saw was 25 to one. That's why I thought 40 to 1 would be better than 50 to 1.