I've recently run into this problem too... my bike would start fine, rev for a bit and then the revs would drop a bit, sputter and then die... The wierd thing is that it only happens once in a while, it's not consistent at all. I brought it in to the shop I get my work done as it started happening after they installed new plugs, K&N filter, velocity stacks and most importantly, a PC3. They thought it might have been the PC, but even with a zero map it still kept occuring. My mechanic thought it might have been the TPS (throttle positioning sensor), but without going into the bike it's hard to find out.
I'm going to try some injector cleaner and see if that helps.
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