Image 5. Gas consumption curve
In the crankcase the pressure is below atmospheric producing a vacuum and a fresh charge of
unburned mixture gasses is flowing through the intake into the crankcase. The unburned mixture
gasses are compressed and just before the piston reaches TDC, the ignition system discharges a
spark causing the gasses to ignite and start the process all over again.
Image 6. Motor viewed from left side
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