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These include the starting system, charging system, cooling, ignition, lubricating, fuel and the exhaust systems.

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These four strokes are intake stroke, compression stroke, power stroke and exhaust stroke.

The force is transferred through the connecting rod to the crankpin, causing the crankshaft to rotate.

The intake stroke commences at top dead centre(TDC) with the intake valve open and the exhaust valve closed.

The cylinders and pistons are in the upper part of the cylinder block and the crankshaft is in the lower part.