2-Stroke Parts
This part moves up and down inside the cylinder.
What is the piston?
This part mixes fuel and air before the mixture enters the engine.
What is the carburetor?
This engine completes its cycle in only two piston strokes.
What is a 2-stroke engine?
This is the first stroke in the 4-stroke cycle.
What is intake?
During the intake stroke, the piston moves in this direction.
What is down?
This part creates the spark that ignites the fuel-air mixture.
What is the spark plug?
These help create a seal between the piston and cylinder wall.
What are piston rings?
This engine requires four piston strokes to complete its cycle.
What is a 4-stroke engine?
During this stroke, the piston moves upward and squeezes the fuel-air mixture.
What is compression?
During the compression stroke, both valves should be in this position.
What is closed?
This part connects the piston to the crankshaft.
What is the connecting rod?
This part converts the piston's up-and-down motion into rotary motion.
What is the crankshaft?
A complete cycle of a 2-stroke engine requires this many crankshaft revolutions.
1 revolution
During this stroke, combustion forces the piston downward.
What is the power stroke?
During the exhaust stroke, this valve is open.
What is the exhaust valve?
his opening allows burned gases to leave the engine.
What is the exhaust port?
This part helps keep the engine rotating smoothly.
What is the flywheel?
A complete cycle of a 4-stroke engine requires this many crankshaft revolutions.
What are two revolutions?
During this stroke, the piston moves upward and pushes burned gases out of the cylinder.
What is the exhaust stroke?
Explain why the power stroke is called the "power" stroke.
Combustion forces the piston downward, producing the engine's useful power.
This passage allows the fresh fuel-air mixture to move from the crankcase into the cylinder.
What is the transfer port?
This is the area containing the crankshaft and is involved in moving the fuel-air mixture through a 2-stroke engine
What is the crankcase?
Between a typical 2-stroke and 4-stroke engine, this one generally has fewer moving parts and a simpler design.
What is a 2-stroke engine?
Give all four strokes in the correct order.
What are Intake → Compression → Power → Exhaust?
Explain how the piston, connecting rod, and crankshaft work together.
The piston moves up and down, the connecting rod transfers that motion to the crankshaft, and the crankshaft converts it into rotary motion.