going to a larger injector requires 1 main thing- control over it. And that is something that the stock honda ecu can't do on its own.
its not calibrated right. I've heard of 310s being ok, but even still, you will be dumping in a lot of fuel at idel.
the 240cc's will support 200 whp, and with a fpr, a little more. ls/vtec's rarely make more than 200 whp...