Hi guys. I had the typical FPR issues, replaced it, and still same problem. Runs good cold and idles high, warms up and then slowly dies out. The only change I can get is when I unplug the smaller hose from the FPR. AfTer doing so, the idle seems to run back at normal idle and it sounds and throttles good. No idea why unplugging it would let it idle normally. Seems to get fuel and air and spark FML it's killing me. Someone please help, I'd be eternally great full. Thanks for any help, sincerely Mike.

 

Perhaps the fuel pump is going bad? That's a pretty weird problem. Removing the vaccum line would make the regulator stop regulating basically. If the pumps going bad and you remove the regulator maybe thats allowing enough pressure for the bike to run. Time to hook up a fuel pressure guage.