Only happens when in motion. Doesn't seem to be at any particular speed or in any particular gear. I know for a fact it has happened in forth at cruising speed 45-40. Sounds like if you disconnected the low pitch horn on a car, leaving only the high pitch horn and gave it a quick beep. There is no change in power or handling at the time of the noise. It's pretty damn loud because I can hear it clear in my helmet. I have not heard it under full acceleration or just putting along, so I'm assuming it's happening about mid range RPM's mid range throttle. All fluid levels are where they should be and bike is running pretty damn good. Gotta be bearing or something rotating. Brakes, sprocket?? Really hoping it's not coming out of the motor! ? I can't get it to repeat once it happens. So I can't pin point it. It scares ya though. Enough to chop the throttle then it's gone Did lots of searches and can't seem to find anything like this.