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Originally Posted by KA24DESOneThree
GSX-R1000 throttle bodies start at 50mm and taper to 42mm. Simply multiplying 42mm by four, we get 168mm. The stock throttle body is all of 60mm. Am I missing something here?
Namely, why flow would be a problem. At all.
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You can't make a comparison like that because theres a plenum where air is being drawn into the engine. Try thinking about it in reverse, 60mm/4 = 15mm. Obviously 15mm ITB's are not going to work. What's more important would be the intake manifold runner diameter, not the TB diameter.
EDIT: bah brain fart, actually 30mm ITB's would have the same flow as a single 60mm, not 15mm. It's still not gonna work.