A thread on another forum got me thinking of the weird stuff that sometimes happens with dirt bikes. Generally mechanical, but I'm keen to hear of anything that left you scratching your head and reaching for another beer.
Oh, so you want me to start? Ok............
Not so much a head scratcher, this one, but years ago we were riding near Mt. Gambier when one guy heard a strange whistle type noise from his air cooled KDX250. He stopped and had his ear to the engine listening, when the spark plug shot out, bounced off the tank, wizzed past his head and off into the scrub taking the coil lead with it.
Took us 10 minutes to find the bloody thing.............
He'd simply forgotten to tighten the plug and it worked it's way out.