Hello
i have Strang experience ,maybe same problem with my brand new 850 just run 170km, after run 10-15min in rode ride (normal heat level) with light turtle engine start ripping and some time suddenly shootdown, after restart the engine (for 2-3 time) speedometer show zero speed & stop add more km in dashboard throw my ride & stop ripping so engine work normally (with normal acceleration) . if restart the engine the speedometer start to work normally and add all my ride KM to before number like noting happened & speedometer start working again.
i have Strang experience ,maybe same problem with my brand new 850 just run 170km, after run 10-15min in rode ride (normal heat level) with light turtle engine start ripping and some time suddenly shootdown, after restart the engine (for 2-3 time) speedometer show zero speed & stop add more km in dashboard throw my ride & stop ripping so engine work normally (with normal acceleration) . if restart the engine the speedometer start to work normally and add all my ride KM to before number like noting happened & speedometer start working again.