ok here it is i got a k6 with 1500 about a month old there is a noise when it has warmed up some times louder than others it almost sounds like a chain slaping around.i did the break in just like book says . i put 400miles on it the first day changing the speed and load. and did the oil change at 500miles i put 20/50 sin/blend is this normal. you can here it best if you sit at a light and bump up to 2000 or so rpms just sounds realy loose