last nite bike started losing power, heard noise like chain hitting something maybe, noise quit after a minute or less, power decreased to a stop. engine tried to start once or twice but didn't. just changed oil, had just gassed up. no noise now like chain. bought 01 c10 w 4800 mi., now has 7500. ran perfect until this. put 100k plus on 75 z1 900, it jumped time twice and got valves, this was different, 900 was instantly gone. this was gradual over a few minutes, not long.. thank you for any ideas.