Just switched to Amsoil 100:1 mixed at 80:1...from Lawnboy 32:1 (4gals)..with a MSC 22-8 adjusted high end to 6980..turned it back about 1/8 turn and dropped to 6860//leaned the low end 1/8 at a time until I had a smooth transition in the air..ran about 5 tanks with a new plug..After the 5th tank I checked it out and it was a nice Hershey brown color..

Runs great so Im not touchin' anything