These caps don’t just fall off, or hanging on by just hope as mentioned above. This is user induced error by not properly inserting the dipstick and then incorrectly fitting the cap. If it stayed on by hope this tread would be a lot longer and older…

This bike has been out for 5 years now and this to my knowledge is one of the first cases.
When did you last check and or replaced your oil?
 
I have an idea when it might have flung off. Crossing some RR tracks were angled, so I transitioned on the pegs to cross more straight on. I caught a little air going over and the bike twisted a bit when it landed. I remember feeling my left thigh pushed over. It might have twisted the cap and jettisoned it on landing. I'm going to go look around there today to see if it is there. But no, I didn't leave the cap loose.
 


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