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Good idea, will have a fiddle. Throttle tube starting to stiffen up from years of use and been left outside since I last rebuilt it on new rentahls (old bmw bars were actually rusted quite badly under the controls).
In the head bearings it has yamalube high temp, it doesn't flow out unless bike was on fire. Oil in frame job. I think its that the bearing setup is simply too small for such a bike. They really aren't that big. Mates have newer f650 and f800 and they go through head bearings at a similar rate. Just a shit design (to be fair most road motorbike imo have undersized head and wheel bearings).
Unplug the switchgear unit and test continuity in the switch gear. Wiggle the cables and see if the reading changes.
Look at higher temp grease, molykote? Do one...but in massive barrels only.