Riding fine, then bike died

[rocketbrick]

Hey Laitch, got the pics and a short video up on my google drive here:
https://drive.google.com/drive/folders/1a8pCH-tGgiuO_ffTeoPNSE__DvTORSBa?usp=sharing

Everything looks pretty clean, I was able to spin it once I pulled everything apart. The seals don't look great, and the shaft doesn't either, but it's not ultra worn down.

Let me know if you wanna see more angles.

[Laitch]

Everything looks pretty clean, I was able to spin it once I pulled everything apart.

I don't understand this statement. You and I seem to have differing definitions of pretty clean.    Clean off the shaft and post a photo of it. The condition of it is hidden by grease and sludge.  Clean down to bare metal wherever possible. Verify this: when the pump was removed from the engine, you could not spin the impeller?

If this were my project I'd replace the impeller using the recommended seal and spacer kit at Max BMW.

It would be helpful to post photos using Motobrick's Gallery feature instead of Google drive. We've had too many useful photos that were posted from offsite sources just disappear. The Gallery feature allows the photos to be inserted into relevant text when desired. You can insert photos into text from your Google drive, too, using the Mona Lisa icon. It's easier on the readers to see images with text.

[rocketbrick]

Sure! I'm working on figuring out the gallery - uploaded a few pics to a category I made but I'm guessing they need a bit more time to upload.

In the meantime, here's the shaft without the slime on it there's definitely some pitting there, but the shaft seems to have its original shape. I've watched some videos where they're basically concave!

[Laitch]

Verify this: when the pump was removed from the engine, you could not spin the impeller?

[rocketbrick]

Verify this: when the pump was removed from the engine, you could not spin the impeller?

I could spin the impeller once it was removed from the engine, it seemed to spin fine

[Laitch]

Ok, the unit wasn't seized after all; it was your description of events that was problematic.  Clean and test the oil pressure switch while you're resting.

[rocketbrick]

Haha! Sorry - I thought I was being clear but I'll take a few more moments when I type.

Oil pressure switch is clean. When I turn the bike on, the oil pressure light immediately turns on. But I'm not starting the bike, as there's obviously no fluids in it.

[Laitch]

Haha! Sorry - I thought I was being clear . . .When I turn the bike on, the oil pressure light immediately turns on.  But I'm not starting the bike, as there's obviously no fluids in it.

I thought I was being clear, too. 

The tests in Reply #68 neither indicate nor require starting the engine. You do the tests just with the ignition switch turn to On. Review. In fact, the oil pressure switch doesn't even need to be installed in the pump for you to test it thoroughly. There are also videos galore describing testing.