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Bikes: 748S, HM1100S, V4SP, Was: DD-A #111
Posts: 13,088
Join Date: Feb 2002
Location: Back in Essex
Mood: Passion Killer
Have you previously had the battery on charge?
Charging a battery generates explosive gasses, so it may have been a localised build-up of gas that was ignited when the bike started.
When was the last time you checked the levels of the battery? Was the vent/overflow pipe for the battery blocked?
All of these things could have caused the build up of gas...