That is weird because I changed my tank last week and it was leaking from a pinhole leak near to the overflow pipe outlet, in the middle of the plastic and not on a join - maybe there was a bad batch?I trimmed the grommet when I installed this last coolant tank so eliminate the stress put on the tank. The weird part in this coolant tank failure is the pinhole leak is not on the weld line but right in the middle of the plastic near where the tube to the lower reservoir connects...
Likewise with the grommet and nothing has rubbed on that point on mine, in fact I can't even see the hole never mind any wear at that point.Well I cut down the rubber grommet that causes stress on the coolant tank so it's not that... as for the pinhole, it's on the left side and there is nothing that can rub it... so the only thing I can guess is that this is manufacture defect?
My tank is 3 years old so I doubt they'll change it, it was already a swap as the first one I bought leaked from new.FYI... I talked to my ducati dealer about the pinhole in the coolant reservoir and they are sending me a free reservoir as I just got this one a month and a half ago... so it seems that this is a defect as my pinhole is EXACTLY where DESMODUKE's was in the picture you posted and not on a weld seam... not sure if your dealer will do the same.
FYI DESMODUKE.... tried to PM you, your inbox is full and rejecting PMs