Hold the shaft down to the BDC and approximately 10% of the shaft before reaching the BDC, flushing holes began to open up to the BDC. The compressed fuel in crankcase cranks up through the transfer port and fills up the cylinder at the top of the shaft.
Then the shaft rises again for the TDC and approximately 10% of the shaft after the flushing hole covered by BDC cardiothoracic surgery, at a time when 20% of the shaft after BDC that moment also a drain covered by the shaft. With the closing two holes then began the compression stroke fuel.
Meanwhile at the bottom of the piston pit entry and fuel began to open new fuel is sucked from the carburetor into the room like a crank. After performing the steps of compression then the fuel undergoing combustion process that is followed by return of the shaft to the bottom in order step effort or work steps.
After approximately 80% of the shaft after step through TDC, sinkhole began to open and process of disposal gas combustion residual to the BDC, and approximately 90% of the shaft after the flushing hole then TDC (transfer) is open and that there was also a sign of new fuel into the cylinder at the top of the shaft while pushing gas remnants out of the hole.
The process of disposal income and fuel into the cylinder at the same time is called flushing. Meanwhile, at the same time the entry holes covered by the shaft.
So the conclusion is that the work cycle the machine motor this two steps with just one rotating crankshaft can generate one horsepower. So the difference with four-step is if the machine four steps to do one job takes one full step while for two steps machine with just one step shaft can produce two work.