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Yup, factory jetting is super-rich, too much fuel for safety. Makes for smoother-running engine with less than max-power possible. No OEM manufacturer would ever tune for max-power, that's crazy and opens them for major liability.
In event you get bad petrol from station out in boonies. Or riding on super hot day or radiator clogs or leaks and overheats. Or have clogged carbs from sitting. You'll end up running lean, not sufficient fuel, and end up blowing headgasket, or punching holes in pistons. So factory jetting is always too rich for safety rather than leaner for max-power. It's typically in 10.0-11.0:1 AFR range whereas max-power occurs at 13.5:1 for NA engines.
So to extract more power, you'd lean out WOT mixtures by using smaller main jets. Remember that '60s hot-rod saying...
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