This will be on a past post somewhere but I thought I would share it in case useful. I left my carbs dry for a month or two in the winter, and when I came to use the bike again, they flooded from the bowl joints. I had bought the shaped gaskets about three years ago, possibly from the USA, and I think they must’ve shrunk when dry due to being Neoprene. I bought the round quality Viton ones from Julie (thank you Julie) and to sit them neatly in the groove, all I had to do was very gently stretch them a tiny amount and they sat perfectly. Happy days.