Hello everyone, it's time to call upon the master-mind of the Tenere community again



I was coming home from my brief European voyage last weekend and at some point, I had to take the highway as I was someone rushed. Got on the highway rode at ~130km/h for some time, then decided to change the tempo a little and bumped it up to ~140. I was happily cruising along for a short while, when suddenly the bike jerked pretty hard and then continued on as if nothing has happened.


At first, I haven't even realized what has transpired: it felt as if the brakes came on hard very briefly and then released just as suddenly. I slowed down considerably, tested the brakes - they seemed to be working fine. Stopped the bike, got off and inspected the disks and the calipers - everything looked just like it should have to my untrained eye.



Got back onto the bike and started riding, doing 120-130km/h for a while to see if the issue manifests again. It didn't, so I decided to try 140-145. In just under 5 minutes, I got the same "surprise", although it wasn't a surprise anymore as I was watching for it.



What happens is that the gearbox shifts from 5th gear down to the 4th gear and then back to the 5th gear very quickly, all by itself. Upon shifting down, the bike immediately starts to engine-brake, and then accelerates when it shifts back up to fifth, causing this sudden jerk I did not appreciate that much.



I slowed down a little, to ~130-135 km/h to see if this changes anything and it did - the bike would not shift gears without my input and I went on riding well into the night that day.



The next day, I completely forgot about the ordeal and at some point, I ran into the problem again, only this time, slowing down to ~135 did not help that much, it would still do these uncalled for gear shifts, I had to slow down to about ~125 before it stopped doing that. At that point, I stopped experimenting, since I still had to do over 1000km to get home and getting stuck this far from familiar mechanics and tools wasn't something I had the time for.



Now, exceeding "critical" speed when overtaking cars was totally fine - I could accelerate up to ~150 when I needed to pass someone, it seemed as if only steady riding at certain speed would cause these gearing problems.



At this stage, I don't have that many ideas of what may be causing such behavior. The only thing I have noticed "abnormal" is that oil level has started dropping somewhat towards the end of the trip and I did not have any I could top it up with. In the beginning of this ~5000km trip my oil level was reaching approximately 1/3 of the way up the dipstick and it was closer to the E mark towards the end of the trip. However, this may be normal oil consumption for "high speed" riding.


Any ideas,, feedback and suggestions will be highly appreciated. I don't usually ride at that speed while at home, since there is no reason for me to do so, but would like to get this sorted out before I undertake my next extended trip. Thanks!