OK... I THINK I have gotten to the bottom of this bolt fiasco. If you'll notice in the picture I posted above... the bolt has NOT spun out, but also has not dropped out. That is because this particular bike is an early UCE engine-ed G-5 motor. The G-5's have/had different left and right side engine covers, and rocker boxes then the C-5's. The left side cover that we are looking at here, on the G-5 , is flatter and not as rounded or bulges out as much as the more common C-5 and B-5 models. In the beginning, back in 2009 , it was just C-5 and G-5 here in the states... two different style left side covers.
Should the bolt spin out.... as it inevitably will because it's not a left handed thread .... On a G-5 the head of the bolt will bottom out and hit the inside of the left side cover.... while there are still a few threads of the bolts still in the crankshaft.... and preventing the bolt from dropping and causing mayhem. Loose ain't good, but at least it ain't tearing up the primary chain and the left crankcase and cover should it fall ... I guess they were thinking ?!
They "achieved" this by the length of the bolt ... leaving it too long, to thread all the way into the crank shaft, and also using a thick washer/ spacer. So when the bolt spins out, it hits the cast "Ribbing" on the inside of the cover.....
The left side cover on this G-5 CAN NOT be pushed on with the bolt un-threaded near it's end. If you look closely at the pic's, you can see some scaring on the inside of the cover, at the ribbing where the head of the bolt was hitting...