Chemical cleaner

[Steve Bryant]

You can buy Carb cleaner that is designed to work on all the different metals and with the exception of some plastics and rubbers will not harm any of the materials that are found in carburetors. It is designed to clean surfaces, orifices, drilled passages etc. as the carb parts are meant to be immersed in the cleaner and left to soak for a pre -determined time as described on the instructions. Once finished soaking, the carb parts are washed in hot soapy water, dried with all the holes, jets and orifices blown clear of water residue. The carb usually is as clean as when made. Rust, tar, varnish and some surface oxidation is removed without scrubbing etc. The carb cleaner is reusable many times before it is too saturated with contaminates to be used any longer, then it needs to be disposed of in the correct manner for chemicals.

The brand we use in the shop on SUs, Strombergs, Zeniths and Webbers is a made in USA  product - GUNK HYDRO SEAL. Use rubber gloves and in a well ventilated area. It's not cheap but it really works well. Purchase it at any good motor spares supplier.

It is also very good at clean other car related mechanical parts.

Hope this is of help.
Stephen