Engine cuts out - Any ideas?

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Rooies

Race Dog
WD Supporter
Joined
Jun 27, 2008
Messages
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Location
Johannesburg
Bike
BMW R1150GS
Technically inclined Dogs, any idea what might be potting here? ->

On Saturday I was going down a little hill, doing about 80/90 km/h on my 2007 1200 GSA.  I shifted from 4th to 3rd and the engine cut out, locking the back wheel, causing a flurry of colourful expletives to escape my mouth.  This happened about 4 times during the ride.  Not sure if I can read a pattern yet, but it seems to happen on uneven/rocky surfaces only, not on even/tar surfaces.  It also only happens when I change gears.

Any thoughts on what could be causing this?
 
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