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2 stroke and 4 stroke pistons.examine.? ive stripped/rebuilt/restored many bikes in yesteryear so i should know this…but i dont..i think i have worked out why but im putting it to you lot interrogate,2 stroke pistons have locating pins for the rings,4 stroke pistons dont..why? 2 stroke chainsaw not staying running after unmarked pistion and rings?? I just put a trial pistion and rings in my stihl 032 it runs for a moment or two and then dies.