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2. String trimmer - Wikipedia

   en.wikipedia.org/wiki/String_trimmer

   A string trimmer, also known by the portmanteau strimmer and the trademarks Weedwacker, Weed Eater and Whipper Snipper, [1] [a] is a garden power tool for cutting grass, small weeds, and groundcover. It uses a whirling monofilament line instead of a blade, which protrudes from a rotating spindle at the end of a long shaft topped by a gasoline ...

3. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

4. Small engine - Wikipedia

   en.wikipedia.org/wiki/Small_engine

   The combustion cycle can be either two-stroke (which results in a lighter engine for a given power output) [3] [4] or four-stroke (which produce lower levels of exhaust gas emissions). [5] [6] The fuel is usually either petrol or diesel. [7] In 1973, a small Wankel (rotary) engine manufactured by NSU was used in a lawn mower. [8]

5. Two- and four-stroke engines - Wikipedia

   en.wikipedia.org/wiki/Two-_and_four-stroke_engines

   The four-stroke engine is more efficient when running at full throttle, while the opposite is the case for the two-stroke engine. When a small car under heavy load runs at half speed, the engine automatically switches to the two-cycle mode, which is then more efficient. The research on this showed a 27% reduction in fuel consumption. [8] [9]

6. Lawn mower - Wikipedia

   en.wikipedia.org/wiki/Lawn_mower

   The most common self-contained power source for lawn mowers is a small 4-stroke (typically one-cylinder) internal combustion engine. Smaller mowers often lack any form of self-propulsion, requiring human power to move over a surface; "walk-behind" mowers are self-propelled, requiring a human only to walk behind and guide them.

7. Brushcutter (garden tool) - Wikipedia

   en.wikipedia.org/wiki/Brushcutter_(garden_tool)

   Basic consumer units use a curved shaft, similar to a basic line trimmer. More professional units use a straight shaft with a gearbox at the cutting head end. Top-of-the-line units use a straight "split" shaft with a disconnection point partway along the shaft, allowing the cutting head to be replaced by other accessories such as pole pruners ...