I have 5 bikes (2 airheads) so I keep detailed records including parts sources & costs so I don't get details mixed up. On 2 occasions I've needed to notify a vendor of a real or perceived problem with their parts supplier.
The perceived problem was an "out-of-spec" oil pump outer rotor OD. They checked their inventory and all of them had the same OD. Upon further research I found a UK parts dealer that reported that BMW changed their spec on that part and all of them at my supplier were within the new spec. My supplier appreciated the updated info.
I note that I've never seen the actual BMW bulletin advising of this spec change but have assumed its out there somewhere.
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