Could it have been a bad oil pressure sensor connection?
Yesterday I did my oil and filter change at 625 miles. I followed the instructions from the workshop manual. I emptied the oil completely, sucking out the remaining with a siphon pump (instead of tilting). I cleaned and re-installed the cylindrical screen tube, the end with the rubber gasket in first, then put in the drain bolt with the gasket, and tightened it to 26 NM. I used Motul 5W40 motor oil, poured some in the filter, rubbed the gasket and tightened it by hand. Initially used about 1.4 L of oil. When I started the engine, the wrench icon showed up (I was at precisely 625 miles, what a timing!) and I reset it. Let the engine run for for 30 seconds, then let it cool for 30 minutes, and checked the level. It was about 2 mm above the MIN mark, so I poured 200 ml, and it showed oil level just slightly above the midpoint between MIN and MAX. I have no leaks, everything seemed tip-top.
This morning I started off to work. The scoot started fine, and ran fine. Traffic was a bit slow, and I barely went over 30 mph. When entering the parking garage, at idling speed, the engine cut off. It was as if I pressed the kill switch. The low oil pressure warning light came on. I restarted the engine, it started up fine. I parked the scoot and examined the oil filter and the drain bolt for leaks. Everything appears to be just fine. 10 minutes later I checked the oil level. It was again between MIN and MAX, and no oil leaks have developed.
As I was fiddling around with the oil dip stick, I noticed that the boot covering the oil pressure sensor moves a bit. I pulled the boot and found that the quick disconnect of the wire coming to the oil pressure sensor is too lose. It was touching the spade connector of the oil pressure sensor but wasn't hugging it tightly. I pinched the terminals a bit and re-installed it. Started the engine, the low oil pressure light is off.
I am posting this in hope that someone had similar experience and can give me some reassurance that I did the right thing. I have changed the oil on cars and motorcycles enough times to feel confident about not making silly mistakes, but some times the attention to minute details causes me to miss big things.
I will leave the scoot in the parking until tonight. I will check for replies to this post before I start it. I am hoping to avoid a major damage.
Thanks for reading