Quote:
Originally Posted by cart around
I can explain this a little bit.
There is a port in the side of the piston. It allows the fuel/oil/air mixture to travel under the piston, through the lower end to lubricate the bearings, and then through another passage on the other side of the cylinder that leads to the top side of the piston for combustion.
That's why the crank seals are so important. Everything needs to be airtight for the proper suction to happen.
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Makes sense. I do remember having to orient the piston correctly when rebuilding mine. I did get it correct on the second try!