A week ago, the bike had a couple incidence where it stalled while I was waiting at a red light. I would hit the starter, and it would fire back up. A couple days ago, it stalled at a red light, but WOULD NOT START! It would crank and crank and crank – but no spark. My first guess was the fuel pump. I disassembled it, and replaced the pump motor. SAME PROBLEM! It started, ran for a bit, then stalled and wouldn't start. Next, I tried testing w/ the fuel filters OUT. The filters didn't seem terrible, but I ordered a fresh set and new o-rings. (CJ Design – they arrive next week.) In the mean time, I removed the filters (pre-filter and main filter) and tested again. The bike seemed to run! I patted myself on the back, and planned on riding to work the next day. Next morning, everything seemed to be fine. But, on my way to work the bike stalled again and wouldn't start! Now, I'm alternating between scratching my head and banging it on the wall. Thoughts: Could running without a filter for an hour have caused the fuel injectors to clog? Seems unlikely, but I put in some fuel injector cleaner to test. Could it be related to HEAT? Maybe when the bike gets up to operating temp, something happens which causes the pump or injectors to stop working? Any suggestions would be appreciated!! I have a track day planned for next weekend, and I would loath to miss it because of this problem.