Clocking or indexing your spark plug

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Clocking or indexing your spark plug, is it worth the effort?

SPARK PLUG CLOCKING OR INDEXING.JPG (34.63 KiB) Viewed 3630 times

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When Motorrad first made me aware of this issue, I jumped on to Google and did a search.
Some people swear by it, some say it's a bunch of balouie..
Some dyno tests show a small improvement and others show no change at all.
One thing that most agree on is that Indexing or clocking your spark plug will not hurt your performance.
After some head scratching it occurs to me that not all engines will show an improvement if they are already getting a good burn regardless of the spark plug positioning.
A engine that should show an improvement would be one that burns better on one side of the cylinder then the other.
If you could direct a large part of the open flame toward the rich burning side, you should be able to get a better burn pattern.
Here is an example of a KX500 engine that shows the intake side of the piston is running way richer then the rest of the piston.

clocking a kx500 cylinder with a window.JPG (89.38 KiB) Viewed 3629 times

As you can see, the intake side of the piston is washed out a lot more then the exhaust side of the cylinder..