Quote:
Originally Posted by red26
Anyone knows if the 300throttle bodies fit the 250? They are 32mm as compared to 28mm on the ninja
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Bigger is not always better. Think about air velocity, not just the possible volume of air. High speed air fills the cylinder and creates resonance (which effectively pressurize the intake at certain rpm ranges) in the intake. Slower air will not fill the cylinder as effectively or quickly. With a high revving engine intake velocity is important.
Also remember that injectors have a minimum pulse width that can make idling difficult for a small engine with large throttle bodies (that need large injectors for 14,000 rpm performance with those large TB's). Unless you have some major internal engine modifications and you really know what you're doing, you're better off sticking with the 28mm TB's and stock injectors.
I'd look more into getting a Power Commander that's able to control the ignition angle, take it to a dyno guy to have him adjust the fuel delivery and ignition timing perfectly for the highest octane gas you can consistently get your hands on.