hey all, my bike seems to have devloped a rattle sound. its a very fast rattle and seems to be coming from the top end it runs really well and runs like a scalled cheetah, but starting has become increasingly hard, time for some work? if it is time, ride 'er til she pukes or fix now and miss some ride time? i wasn't planning on anything til winter. EDIT: the rattle is not at all times.