2-Cycle: This engine uses a mixture of gasoline (unleaded is typically better for the engine) and specially formulated 2-cycle oil; the oil lubricates the engine, allowing for reduced friction of the engine parts. The oil adheres to the surfaces of all moving engine parts, making the 2-cycle engine more durable while mowing on hillsides. Because the oil is premixed with the fuel, no attention to the oil level is required and no oil changes are needed. 2-cycle engines have a power stroke every revolution.
4-Cycle: This engine uses only gas in the fuel tank, while the oil is stored in the crankcase. The 4-cycle mower must be operated on a fairly level surface, thereby keeping the internal parts of the engine lubricated with oil so the engine can continue to operate. Lack of attention to oil level can cause catastrophic engine failure. Oil changes are considered normal maintenance. 4-cycle engines have a power stroke every other stroke.
Air Filter: Delivers a clean air supply to the carburetor to help keep engine running efficiently. It requires customer maintenance to keep the engine running efficiently.
CARB: California Air Resources Board. It has introduced exhaust emissions regulations that affect all outdoor power equipment sold in California. In order to promote public health, welfare, and ecological resources, the CARB is responsible for the control of air pollution from consumer products and the identification and control of toxic air contaminants.
Choke: Richens the fuel air mix to make starting a cold engine easier; not used for starting once the engine is warm.
Drive Gears: Connects the transmission to the wheels to propel the mower without pushing.
Electric Start: Battery powered starter motor that starts gas-powered engine without pulling on the cord.
EPA: Environmental Protection Agency. Independent federal agency that was created by Congress and is directed to protect human health from significant risks and to also safeguard the natural environment. The EPA has produced 49 state exhaust emissions standards for engine powered outdoor power equipment.
Handle Height Position: It is important that the handle of a walk-behind mower has several adjustable positions, for better control and comfort.
HOC: Height of cut. The height that the blade is located above the ground line; adjustable by a lever at each of the four wheels.
Horsepower: A unit for measuring the power of an engine. Higher rated horsepower improves ability to mulch taller grass.
Housing: Made of aluminum, steel, and sometimes plastic. The part of the mower that everything is mounted to; it houses the spinning blade.
Mulch Fan: On select Lawn-Boy walk-power mowers, it is connected to the blade and helps accelerate the grass clippings for better mulching without clumps.
Mulch Plate: A walk-power mower component that is easily installed or removed from the side discharge and/or grass bag opening on the housing to allow mulching, side discharging, or bagging of grass clippings.
Mulching: The process of finely chopping grass clippings and returning them back into the lawn. It means no bagging or raking.
OPEI: Outdoor Power Equipment Institute. OPEI is the international trade association whose members are manufacturers of powered lawn and garden maintenance products. The Institute promotes the proper use of outdoor power equipment, and serves as a link between the industry and the public. OPEI represents the outdoor equipment industry in legislative and government affairs and provides industry economical and statistical information.
Prime: Richens the fuel air mix to make starting a cold engine easier; not used for starting once the engine is warm.
Primer Bulb: Flexible push button bulb that delivers fuel to the engine for easy cold starting.
Push: A mower that is propelled with human power alone.
Rear Bag: A clipping collection bag that is mounted behind the mower, underneath the handle.
Recoil Starter: A retractable rope device for starting the mower engine.
Self-Propel: A mower that draws on the power of the engine to propel the wheels. Makes mowing less strenuous. Typically either 1 speed or 3 speed transmissions are available.
Side Bag: A clipping collection bag mounted to the right side of the mower. An oversize bag is available for leaf collection.
Side Discharge: An opening on the right side of the mower that safely disperses the clippings on the cut grass surface when not mulching or bagging.
Spark Plug: Is located in the engine combustion chamber to ignite the fuel air mix.
Throttle Control: A handle mounted device used for controlling the engine speed, and sometimes for activating the choke mechanism.
TRI-CUT Blade: Lawn-Boy blade that side-discharges, mulches, or bags grass clippings.