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A larger gap will make a larger spark, which should result in a better burn in the cylinder. However, a larger gap is also harder to arc across, so you're more likely to get misfires. The idea is to make it as big as possible without causing problems.
FOG has stated that the EX500's stock ignition system was known to have spark issues at the top end. I didn't personally notice any issues on my street bike, but with the CoPs and Iridium plugs I was able to open the gap up to .032" (stock is .024-.028") without creating any noticeable problems, and it should give me a better spark.
Even if the performance is 100% identical to stock, simply cleaning things up on top of the engine makes it worth doing in my eyes.
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*** Unregistered, I'm not your mom and I'm not paying for your parts, so do whatever you want with your own bike. ***
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