The sump was topped exactly to the full line as it was when I changed the oil about 20 minutes running time prior to the event.
He returned from a long loop down the coast then across Texas to Florida and return. He commented that he'd heard a crunch sound some times ago and thought it may have sounded a bit different once in a while while iding. I found a piece of material which looked like a chipped gear tooth which was on the magnetic drain plug & what looked like a small about of steel in the oil filter. He was in a rush to get going so I changed the oil, replaced the rear tire, while he JB Welded some radiator damage. He had bent the fan mount to move the fan further from the radiator which I advised that he correct. A few other small service operations and he was off again only to have it exhibit some loud crunching noises so he pulled into a rest stop and had the bike hauled here.
He had been topping up with oil as it was consuming ...think he said about 2-1/2 litres in 1,000 km while running very fast highway with passenger and maybe 100 pounds of gear. I doubt that he ran it low on oil as he's quite attentive but will ask for more details. Perhaps we can provide come evidence as to the not enough oil to that bearing hypothesis?
Please advise as to any area or aspect of possible investigation. I will need to get it done ASAP but would like to cover as many bases as can. I'm still thinking that this is the third of these bearings with which I've dealt but second one for certain. Too long ago to recall whether the bearing was the primary issue or something discovered in dealing with another issue. I probably warned about worsening memory as one gets older but forget.
In the morning I will investigate further. It looks like the lower part of the outer race is chipped but can't see any other damage at the moment so am optimistic regarding just swapping out the bearing.
I can't recall if the balancer bearing can be withdrawn from the outside or whether have to split the case..... Time to sleep and check the manuals tomorrow.
I think all balls are there although the cage is completely out of the bearing and scattered in pieces.
Is there any visible damage other than the bearing cage? It doesn't look too bad, but there are balls missing.
"And, I might add, more balls that I have", Tom said roundly.
Please measure the amount of oil in the sump before tearing down.
Take lots of pictures!
p.s. I'm going to move this to the 2008+ sub forum.