Lawn-Boy 21" RWD (rear-wheel-drive) self-propelled electric-start mulching lawn mower for sale. This is a MEDIUM-DUTY lawnmower with a powerful Kohler XT650 149cc 6.5ft-lbs auto-choke engine (comparable to a Honda engine), so it will handle standard to large sized residential lawns with ease. It starts on the first pull (no priming or choke settings are necessary), however it also has an electric start function which will crank the engine by turning the starting ignition key (just like a car). This mower is RWD self-propelled, so it has a lot more power and traction than a FWD mower, and so will easily propel itself uphill. This mower can mulch grass with the installed heavy-duty mulching blade, or be used with the included grass bag. This mower has been fully tuned-up and is in overall excellent condition. I am a small engine mechanic and have fully serviced this mower: -new spark plug -new air filter -new engine oil -carburetor has been disassembled and serviced -mulching blade has been sharpened and oiled -self-propulsion belt and function has been tested -has been inspected and power-washed -90day no-start warranty