There is nothing wrong with the carbies, they are a brilliant design and will operate under the most awful conditions unlike most other carbies. The one and only real issue with them (apart from a couple of Victa design blunders) is the float needle. The Viton tipped are a big improvement so it seems the seat is the major fault now. Polishing the seat with a cotton bud and metal polish in a battery drill does help but no guarantee it solve the problem. So annoying that all other carby manufacturers can make needle and seats that work perfectly and still we continue to fight these. The Carbymaster has come up with a number of improvements but they continue to be problematic