Off we go. Eventually we stop for gas and I fill it up to the cap on the side stand. We haul ass. It runs great until I hit a sharp bump about 4+ miles from the fuel stop. Immediately after I hit the bump the engine shuts off like I hit the kill switch. Bwaaah . . . . bwaaah it says as I work the throttle on/off twice while dead engine deceleration slows me down in 6th. Ut oh! THIS AIN'T GOOD! It finally catches half heartedly while running rough and not taking the throttle. Part throttle running is terrible. The normal road speed keeps the engine turning when it's not running or wants to stall. Then it gradually smooths out and continually improves over the next 20 minutes or so. I immediately thought the EWS, fuel pump or pump controller just took a dump. Fred thought the EWS plug was dislodged after not being fully connected. That sounded right and I gave it a squeeze in the general area . . . . doing absolutely nothing. There is no plug visible from the rider's seat.
It continued to be temperamental by hesitating/stumbling a little, right at the on/off throttle transition. My anger toward BMW is growing. This is a serious malfunction that could leave me stranded. After about another 20+ minutes it gradually returned to normal for the rest of the day. Do you have a diagnostic clue yet? At the time, I did not, except for those notorious German electronics I mentioned. Day 2, almost the same scenario, gas up really full on the sidestand and go several miles . . . . except instead of a bump triggering it, it was after passing an 18 wheeler WOT for 2 gears to 8 thousand or so. On the slow down after the pass I upshift to 6th, then get on the gas again only to find there is a dead engine, again!!! Dead as in key off dead! Same scenario. Rough running, gradually gets better, then it runs normal. Huh??
On the long ride after it recovers, I mentally put all the facts together and come up with 2 solutions. Loose battery terminal -or- liquid fuel in the charcoal canister. Because I added lock washers with longer SS battery bolts, it couldn't be a loose battery terminal. What a coincidence it would have to be for an electrical component failure to occur about the same distance after overfilling the fuel tank. Duh! That facts are all there. It all fit!! The gradual improvement . . . . all the way to running flawless again, does NOT happen with failing electronics or poor connections. Even the burbling sound the exhaust made as it was recovering sounded like too much fuel. Confusing me was the way it shut off . . . both cylinders simultaneously go dead, and in a few seconds, come back in together.
You can't imagine how sickening it was to have my brand new bike cutting out right underneath me!!!! I'm over it now and take back all the belligerent animosity and bad thoughts I had toward the BMW factory. It was all my fault, my bad. I did side-stand overfill the fuel tank up to the cap. It was so full the cap center portion actually just touched the fuel when I closed it. I mistakenly thought the visually much higher vent location forward of the tail lite was so high there would be no negatives to overfilling the tank. Couldn't possibly happen. The engine heat does cause significant volume expansion of "just-from-the-ground" cold gasoline. It very likely contributed to the gasoline getting forced/splashed into the vapor vent hose, then the charcoal canister, especially with the bike accelerating, going uphill. There was a lot of that!
I was a little cloudy as to why the engine shut off both cylinders simultaneously until I realized there is only one O2 sensor and it told the BMS-K computer: "Dude . . . it's way too rich!!" That's when it stopped all fuel injection as the fuel drops were fed from the fuel soaked charcoal canister into the intake manifold. It was way too much fuel for normal running or power producing combustion. The liquid fuel was confusing/corrupting the correct EFI metering. Now I know, it's not BMW's fault. Problem solved. My bad. No more side stand over-filling the tank up to the cap to expand the fuel range. I promise.
Yes, the excess fuel potentially could have fouled the sparkplugs -but- we were repeatedly riding a brisk pace up mile plus long 8% and 9% grades without a hint of misfiring. After the fuel was gradually purged from the canister over a few hours runtime, it ran perfect!
FredRydr and I rode 270.3 miles (435km) Friday, with no particular destination other than "North & East" and a desire to travel on the very entertaining roads in the West Virginia mountains. Saturday's ride, again with Fred, was 292.8 miles (471.2km) of some of the best M/C roads in the USA. About 50 of those miles was in the drizzling rain. CURVES!! Lots of them, on very smooth, well paved asphalt roads. Add in the elevation changes common to mountain roads and you have M/C heaven. Most everyone drives pretty fast there, even SUV's & pickup trucks. That's strange, considering the frequency of sharp curves and who is driving them. Also, the police force is for all intents . . . . . absent. That bike of mine sure can corner fast! What a blast it was!! We didn't crash, run off the road or get arrested. Yeee-Haa!!
After all that burned on dirty wheel spray, the entire exhaust system on my formerly showroom condition brand new bike looks like it has suffered 8 years of neglect. My pointing out how messy it was prompted the wise response; "It's a tool, not a jewel". Whatever.
I just spent the better part of (today) foul weather Tuesday cleaning the entire bike. It required removal of the lower body panels, windshield, seat and muffler. The entire exhaust had to be cleaned with steel wool and soap, then I washed-n-waxed all the painted parts of the bike and some of the engine. It looks like showroom condition again!
BTW, attending a web competitor's F800 bash wasn't a defection. I was just curious and mostly wanted to ride the mountain roads for 2.5 days again. For the most part, I was disappointed there wasn't a Vann, Pat, DJ, Al, Phil, Wayne or Dave among the group. Except for the outgoing Windy on his Randy Mamola BoxerCup, it seemed quite empty.
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There will be a full detailed photo outline of this half day medium-easy installation process after it's completed in a few weeks. Because I'm retired, I can afford to wait for no yard chores and bad weather to take it apart! 
