hello, my gsx250f across is having major problems. before xmas my bike just shut off on freeway , 0 revs, and lights still on. wouldnt start, was trying to but wouldnt go. next morning started ok. happened again next day but waited an hour then started ok. there was always a noise under the seat before i started the bike , like a ticking noise. previously it slowed and went away. now since i came back from overseas, the ticking noise goes crazy,, really fast and doesnt really go away,, and bike wont start. i changed drained oil, changed oil filter, charged battery, changed air filter, and got it even started a few times, but only with choke, and now as soon as i try to give it revs, it dies my mate reckons it could be the fuel pump but im not sure. can anyone point me in the right direction ?