This is an extract lifted from a post on another forum by the owner of the burning bike. It was posted on the BMW Club of WA forum on 6 Dec 2015:
"The clutch was acting up; gears were hard to change. So we chose to keep going instead. Keeping my eye on the temperature gauge, the motor stayed at the same temperature so we sat on around 100km/hr.
All of a sudden, just before the Jarrahdale turnoff, the bike made a bit of a noise and conked out. Thinking that the clutch had just given up the ghost, we pulled over and got off the bike. I noticed there was oil on my right boot, something must have popped and that was the noise - maybe. Walking around the bike and taking a look, I said to Marian, "Look there's a flame underneath the tank!" The flame very quickly engulfed the tank. Getting away from the bike as quick as we could, it took only a minute or so for the whole bike to go up. We were very lucky that the bush beside us didn't go up also and no one was hurt."