I've been having some performance issues at higher RPM's after the bike has warmed up. Feels like it is starving for fuel. I bypassed my pump today and got out and let her rip for about 30 minutes without a hint of a problem. Not to say that tommorrow when I ride to work, it won't go ape on me. But so far it runs better than it has in awhile. I was pushing it pretty hard too and she wound up great. I'll update later. Hope this helps, this thread has helped me. I wasn't looking forward to buying a new pump and a used one seems a little iffy.