50 : 1 oil works on all saws life saw engine not run lean carb. adjustment adjust best with Tach rich up high side mixture slow rpm's down have more power 10,000 to 11,000 rpm's.

Thanks I planned on opening the high speed jet a tad before running, I like mine a little rich on top! Used to port my MX bikes when I raced so gonna see if I can improve, it'll go or blow when finished, lol