In a two-stroke engine, the piston acts as both the intake and exhaust valve. When the piston is at the bottom of its stroke, it uncovers the intake port, which allows fresh air and fuel to enter the cylinder. When the piston is at the top of its stroke, it covers the exhaust port, which traps the burned gases in the cylinder. The spark plug then ignites the air-fuel mixture, creating pressure that drives the piston down.
When the spark plug is removed, the seal between the combustion chamber and the outside air is broken. This allows the pressurized gas in the cylinder to escape, which causes a loss of power and efficiency. In addition, the escaping gas can also cause damage to the piston, cylinder, and other engine components.
Therefore, it is important to always make sure that the spark plug is properly installed before operating a two-stroke engine.
