Why is it important to understand top dead center vs. overlap on a 4-stroke?

One of the most misunderstood areas when working on 4-stroke engines is the placement of the piston for inspection and assembly procedures. Check out this video for close-up photos and in-depth explanation of the two positions. For some reason, I find many entry level techs all too often “choose” the overlap position when setting TDC. They soon learn that this just simply requires re-work.
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