Rev Up for the 2025 Small Engine Tech Certification – Turbocharge Your Skills!

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What is the primary purpose of the intake stroke in a four-stroke engine?

To compress the air/fuel mixture

To exhaust the burned gases

To obtain fuel and air for combustion

In a four-stroke engine, the primary purpose of the intake stroke is to obtain fuel and air for combustion. During this stroke, the piston moves down the cylinder, creating a vacuum that allows the air-fuel mixture to enter the combustion chamber through the open intake valve. This mixture is essential for the combustion process that will occur in the subsequent compression stroke.

The successful intake of the correct amount of air and fuel is critical for optimal engine performance, as it directly influences the combustion efficiency and power output of the engine. This process is essential in setting the stage for the subsequent compression, ignition, and power strokes that will follow in the engine cycle.

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To ignite the air/fuel mixture

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