STIHL MS 271 Farm Boss
50:1 premix
Tune carb on a warm engine. A rich no-load high-speed setting may four-stroke slightly before cleaning up under load.
Maintenance: Air filter: 10h; Spark plug: 25h
Parts: NGK BPMR7A, Stihl 1141-120-1603, Stihl 0000-350-3502