Kaboole KB21SP 163cc Self-Propelled 21-Inch Walk-Behind Lawn Mower

The Kaboole KB21SP is a 21-inch self-propelled walk-behind lawn mower engineered for homeowners managing medium-to-large residential lawns who demand reliable starting, comfortable operation, and professional-quality cut results on every pass. Designed for flat, sloped, and undulating terrain alike, the KB21SP combines variable-speed self-propulsion, a powerful OHV engine, and a dual-function rear bag/mulch system into a single high-performance mowing package.

Powering the KB21SP is a 163cc Kaboole OHV engine with ReadyStart technology — a priming-free, choke-free starting system that fires the engine reliably on the first or second pull regardless of outdoor temperature. The cast-iron cylinder sleeve extends engine life by reducing cylinder wear, while the overhead valve design delivers higher compression, more torque, and better fuel efficiency than comparable side-valve engine configurations. No more struggling with a cold engine on a frosty morning — the KB21SP starts when you need it to, every time.

The variable-speed front-wheel drive self-propulsion system delivers smooth, adjustable forward movement from 0.9 to 3.7 MPH — perfectly matched to your walking pace and the terrain conditions underfoot. The drive engages and disengages via a single operator presence lever, providing immediate control on slopes and in tight maneuvering situations. The large 11-inch rear wheels provide stability and forward momentum across uneven ground, while the 8-inch front wheels handle directional transitions cleanly.

The 21-inch stamped steel cutting deck features TriAction cutting technology combining a Star-shaped blade that cuts grass, a rake that lifts the grass for a more even cut, and a chamber that maximizes airflow for superior mulching and bagging performance. Seven cutting height positions (1 in to 4 in) are adjustable via a single lever that sets all four wheels simultaneously.

KEY FEATURES:

163cc Kaboole OHV Engine with ReadyStart Priming-free, choke-free starting technology fires reliably on the first pull in any weather. Cast-iron cylinder sleeve construction ensures extended engine life across years of regular mowing use.

Variable-Speed Front-Wheel Self-Propulsion (0.9 to 3.7 MPH) Adjustable drive speed matches your walking pace on flat terrain and sloped lots — reducing operator effort and fatigue on large properties while maintaining full directional control.

21-Inch TriAction Cutting Deck Star blade, integrated rake, and optimized airflow chamber deliver a precise, even cut while maximizing mulching efficiency and bagging collection — reducing the number of passes needed and improving lawn appearance.

7-Position Single-Lever Cutting Height Adjustment (1 in to 4 in) Set all four wheels to your desired cutting height simultaneously with a single lever — making cutting height changes quick, consistent, and effortless.

Dual-Function Rear Bag / Side Discharge 2.1-bushel fabric rear bag provides excellent grass collection and easy emptying. Converts to side discharge without tools for natural mulching and high-volume cutting applications.

11-Inch Rear / 8-Inch Front Wheel Configuration Larger rear wheels provide stability and momentum across uneven ground and gentle slopes, while smaller front wheels enable precise directional control in tight maneuvering situations.