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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
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Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Check the battery connections are nice and tight.
I had similar symptom and it turned out to be vibrations in the battery tray causing the loose connections to spark and upset the electronics.
They may look ok, but give the bolt another turn just to be sure.