ECHO CS-4510 18" Rear-Handle Chainsaw Whether the job requires seemingly endless storm cleanup or bucking loads of firewood, the CS-4510 provides power and performance over the long haul. Features Has a 45 cc professional-grade, two-stroke engine for superior performance and durability The three-point spring vibration-reduction system ensures operator comfort It has a momentary stop switch that automatically returns to the "ON" position Its dual-post chain brakes increase durability Has a side-access chain tensioner for easy chain adjustments Its purge bulb delivers fresh fuel to the carburetor for easier starting Has a choke with an automatic fast idle that allows for easy starting Its automatic adjustable oiler operates only when the chain moves, reducing oil consumption Its spring-assisted starter reduces starting effort