2 Stroke basics (chainsaw version) as the piston rises a vaccum is formed in the crankcase pulling gas/oil/air mix into the crankcase. This lubes the bearings and cylinder walls. When the piston reaches tdc ignition occurs driving the piston down making power, and pressurizing the mix in the crankcase. As the piston travels down it uncovers the ports allowing the burnt charge to excape out the exhast port. then the intake uncovers allowing the pressurized mix, from the crankcase to move in the cylinder. The piston travels back up and the cycle starts over again.
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