Need help, 2016 rmz 450 clicking sound when under load and motor is hot. Doesn’t click when motor is just warm, and only clicks when motor is under load “accelerating” does not click at idle or rev. Sounds like aluminum hitting aluminum, bike runs great very vague sound have to listen to hear it. Fresh oil always and 33 hours on bike. Running ecstar oil. Bikes is always kept cool I run engine ice and have higher boiling temp radiator cap.