Husqvarna 7021RB 21-Inch 160cc Honda GCV Gas-Powered Self-Propelled RWD Lawn Mower with Blade Brake Clutch Mulching grass returns vital nutrients back into the soil. Premium Honda engines are more efficient. The choke will automatically disengage after the engine starts. Handle height is vertically adjustable to fit the individual. The curvature of the handle keeps your hands and wrists comfortable during operation. AutoWalk variable drive system allows you to mow at your own personal pace by simply squeezing the trigger on the handlebar.