This is Echo's 25.4 cc professional-grade two-stroke engine manufactured from military-grade magnesium. Automatic, adjustable oiler to match cutting conditions. Easy start-ability especially for re-starts in hot, dusty climates. Large 21 fluid ounce fuel tank for extended run time between fill-ups. Over-molded front hand grip for extreme comfort. Ribbed fiberglass outer shaft for rigidity and control. Tool-less access for convenient in-field servicing. Two-stage air filtration system dramatically increases cleaning capability and allows for longer maintenance intervals.