Hi Jaffa, nothing abnormal about the knob setup, although i've never seen one on a utility.
As for the carby, a search on ebay will get you what you're looking for, just note the shape of the mounting area of the carb to the tank.
I'm not convinced that the motor is a factory fit on that base, I'm not even convinced that base is meant to have a petrol powered motor on it, the raised bit around the front almost looks like an electric motor powered utility base, although i could be wrong. Could you take come pics of the base where the engine mounts and possibly a pic of the underside to determine if it's got a victa blade setup on it.
Good to hear from you,
Cheers, Ted
