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On my People S 250 I replaced the mechanical seal in my water pump and my oil seal just behind it.  Changed the oil, gave it a test run around the block for 15 minutes which overheated it so I immediately turned it off and burped the coolant.

But now as I idle it for 10 minutes, the oil pressure light comes on, flickering.  I know there's enough oil in there and I even put in a bit more, likely too much, just to test it and I get the same result the second time.  I see no smoke coming from the exhaust or evidence of mixing of coolant/oil which was my first thought having just replaced the seals. 

Update: 7 hours later the issue isn't repeating.  I ran it for 15 minutes.  It must have been caused by coolant shortening wiring during burping of the system.  I don't see why that would trigger the oil pressure warning after ten minutes of idling, but the only thing different from before is the coolant should have dried up by now. 

Referring to this Youtube video, I am about to modify my new starter for my People S 250 because the previous one broke/shattered a bushing.  I was getting a smoking battery instantly when pressing the start button and when bench testing it, it was deader than a door nail.

Basically in this video the youtuber recommends retrofitting an o-ring to the armature by filing a groove into it, to prevent oil seeping inside.  Then he recommends drilling a small drainage hole on the bottom to release oil that gets into the starter.  What are your thoughts on this?  Do the starters really need this mod to last long?

On a side note I am not sure what caused the starter to break but as I replace it I want to ensure it doesn't fail on me again and leave me stranded somewhere.

My People S 250 shut off on the highway after losing the oil drain bolt.  No lights warned of engine overheating or oil pressure lacking at any time.  After pulling over, I saw coolant overflowing and then a puddle of oil under the engine.  That is the moment I looked and realised I forgot to torque the oil drain bolt completely - it was gone.  So we towed the scooter home, I replaced the bolt, refilled the oil and checked the radiator/coolant level which was all good, and tried starting it.  It turns but no longer starts.  Considering that the cause was probably the oil leaving the engine, but the engine still turns, what is likely preventing it from starting now?  I will post the solution for future reference once I find out.  I also wonder why I got no overheating light or oil light; they work when turning the key but never did during the riding.