I just picked up a new-to-me Jonsered 801. Seller says it was just serviced, and it looks great! Couple issues, though. First, not really a big issue, but the off switch doesn't work. Instead, I can pull the choke and kill it. Next, it acts like I need to up the idle - won't stay running. I only used it a little when I got back. Started fine, ran fine, worked for about 15-20 minutes, but then it started sputtering out when left to idle. The gas should be fine (new enough). Any ideas? Also regarding gas, does anyone know what the mixture ratio should be on this old saw? I thought I saw 25:1, but that seems high.