When you are trying to keep a nearly 30 year old grey import on the road or on track in my case, you are always presented with challenges. I’ve been using GF Racing UK for several years now and I thought I’d give them a plug on here because I know there are a few of these bikes in peoples’ garages. These guys offer original new and used and pattern parts for both road and race bikes as well as bike preparation and workshop services. They have many years experience racing the 400s so are a great source of information. They are in Brigg, Lincolnshire, https://gfracinguk.com/?sesid=tft73m2nc3o3720nqsfgqclpu0 They use DPD for delivery which I have never had an issue with and (in stock) bits are usually delivered in 2 to 3 days. Andy
I used him when I had my NC30, gem of a bloke who helped me out a few times, even sending out parts before I’d sent payment.