Good weblink...you need to join to read the thread...and its easy and worth it to join....
Here is a reply from Edwyun....what a good guy...he's everywhere
this exact thing happened to a friend of mine at a trackday on his 851. Like ward said, check/replace the regulator. IMHO, i'd use a OEM updated R/R (3-phase type; just don't use the extra yellow wire).
Ride safe,
Edward
900FE (#231)