I fitted a brand new Amal 276 to a friends 3HW, purchased from Hitchcocks. I assumed it was set up ready to go, but there was all sorts of issues....even flames. When I stripped the carb, everything was assembled loose. The jets were in just a couple of threads. I reassembled everything properly and on the following working day, I spoke to Alan Hitchcock about it. Apparently they build the carb to your spec from boxes of new parts, and this guy had just thrown it together under the assumption that the customer would take it apart for checking. I don't think Alan was very pleased with him. Ron