Is this "oil priming" issue related to the Oil Pressure Relief Valve or the Oil Pump & Chain Drive Assembly? Specifically, a dirty/sticking/faulty OPRV or worn OP&CD Assembly? Or is this just a good old fashioned "engineering" flaw?
I've always said that engineers should be paid by the overall functionality of their work and not just paid to design or engineer "something." Either that or force them to use the things they engineer until they come up with good functional designs.
The oil priming issue is related to the fact that it's an 800, and not, I believe to any additional sticking or dirty valves and such. Just a design "flaw" or characteristic, if you will. I've seen and heard too many cases where after a lay-down, or even after throughly draining the oil and filter, that these engines just won't prime. I wouldn't operate one without a functioning oil light. At the very least, after an oil and filter change, keep the filter loose until you start the engine. When the air expels itself from the filter and the pressure builds, you can actually feel the filter tighten up on its threads. Tighten up the filter and you should be fine until the next event like a lay down, or an oil change happens. Maybe someone like sfair can shed some more light on this, but I have not seen any comments from him so far. I've seen this twice on my wife's 800, once from a lay down at a stop sign, and once from an oil change. This bike is a very low mileage bike with a clean engine.
My wife has only laid down her bike once, and the engine guard prevented any damage, but she carries an oil filter wrench in a saddle bag just in case.
These bikes are wired so that if you lose oil pressure that both the oil and the temperature lights come on. This is to get your attention that you have NO oil pressure! Too many people have ridden their bikes home, started them the next day a few times hoping the problem had rectified itself, and even made U-Tube videos of their engines running with NO oil pressure and the warning lights on. Makes you wish there was a database so you would know to never buy one of these person's bikes used!
BTW, the older 1500's with the plastic oil gear have had the same fate applied to them after the oil gear fails. Their owners have ridden them several miles home, even while losing power from the engine trying to seize.
You just know that if they got a puncture in their brand new $200 Metzeler tire, they would immediately call for a tow so they didn't damage their expensive tire, but when the oil pressure light comes on, well hell, it's just a few miles home on their several thousand dollar engine that 's being trashed! It boggles the mind!