Will run both need carburetor adjusted they will run but the mac chain saw will only run on mid choke. Just needs air and gas adjusted. Has brand new gas plunger/ gas lines and fuel filter. The Husqvarna rancher 50 series needs just needs air and gas mixture screw adjusted as well. Had both runing the yellow one was running well and then I adjusted the mixture screw a little bit it shut of off and I pulled it a couple times and it wouldn't start. The other one would start but when you hit the gas it would die out. Just done messing with them .