i was just thinking - how long before bikes follow the cars when it comes to OBD and crap like that? or do they already have that on them? from what i recall, tweaking a car with an OBD system is a real PITA, since it has a habbit of undoing your performance mods. carbs are more complex mechanically, but they're all mechanical, so you can just get in there with a wrench or something and tweak it. the flip side is that if you have a way of tweaking EFI, it's HUGELY more flexible - but you need a proper setup to do it all.
as far as air versus liquid cooling? same deal - air is simpler to make and has less crap to go wrong, but liquid is technically better for performance.
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