Further to my dealer visit, I had a good chat with the workshop foreman, who said of the 50 or so 961s they'd sold, only one had come back with a problem.. an air temp sensor had failed, he said this lives on top of the air box in a slight hollow. In heavy rain it could be damaged by water. The factory had since relocated it to prevent the problem. The owner of the bike with this problem regularly jet washed his bike..
I also asked him about supplying parts to Donnington era bikes. He told me when they first became a Norton dealer a couple of owners of these older bikes came in to have them serviced. Being new to Norton, they agreed, only to find the Norton factory maintenance Software didn't work with the older bikes, which limited what they could do. They also had no access to the old workshop manuals, apparently there is some copyright issue. After these problems they made the decision not to work on the older 961s. As for supplying spares to the older bikes, they have had to wait for their own spares.. my new headlight bracket to mount a flyscreen hadn't arrived in time for my service, which had been booked in 7 weeks beforehand. Meanwhile, a part may be different and item numbers also changed from the old regime. Therefore, they have to give priority to their own customers.