Pistons always have directional arrows on them showing you which way to install them. Most times the arrow point to the exhaust but there are some weird exceptions (towards PTO, etc) and you need to check before assembly. One obvious reason is locating pin location for 2 strokes and valve size pocket on 4 strokes. There is another reason. The wrist pin is often offset to lessen piston side thrust to reduce wear.
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I have been involved in mechanics and motorcycling from a young age. I formed Cycle Improvements in 1981 and still have the same passion to learn today as when I started. Hope you find this blog interesting and educational.