It came back !
After a short 5 day trip, with some rain my problem came back. Lost quite a bit of top end power especially at elevation. Today at home I decided to have a look. Striped down the throttle body linkages and found the front secondary valve was almost stuck solid ! Dismantled / cleaned / lubed. All works as it should. Seems it is a common problem with vstrom, particularly the front cylinder throttle body. Worth making it a regular service schedule item to lube the ends of valve rod and assy. If you have C-28 error this could be it.
There is a video on Youtube explaining it well. https://www.youtube.com/watch?v=LYM-80q0JyA
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Regards Tim
Learning my craft for the big stuff, it won't be long now and it's not that far anyway
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