Sleeving Vintage Amal carburator

[thirdbike]

At the moment I am not sure of the BSA OEM carburetor gasket thickness. The problem is compounded with many aftermarket gaskets being paper thin and poor quality. In the case of the Triumph twins, the heat transfer is even worse as they called for the use of an O ring. The carbs being made of a soft pot material and is easily distorted especially with heat. The cure I have found is the installation of the extra thick gaskets used on the Nortons. The material is hard rather than the more common compressable gasket material. As such, the carbs could be bolted up securely without the fear of distorting the flange. Keep in mind that as the flange distorted so did the slide bore go out of round. A lot of slide sticking issues were attributable to this warping. Many users simply sanded the flange flat again resulting in the removal of material from the mounting ears. This only served to weaken the ears leading to even further warping. If you have another solution, please do fire away.