I think that is just a serial number, probably created by the importer.
The thing we need to work out is whether this is actually a GMC Powerbase 800 Watt 2 stroke generator. Those things were sold by Bunnings several years ago for $145, and I'd estimate the value of one now, in good running order, would be about $50. You have said it is a 1200 Watt model. If so I have no idea what it is. We can't get far without both of us knowing what you're talking about.
The amount you can afford to pay for spare parts for it is very small if you are talking about an 800 Watt 2 stroke throw-away generator. I can't imagine you can replace the carburetor with a new one for less than $50, and it would probably be more. Hence if the body of the carburetor is damaged, you seem to be stuck with either cobbling it into working condition, or fitting some other second hand chainsaw carburetor to it. If the problem is not the carburetor body, but just a bit of mangling of linkages, the affordable solution would be to unmangle them.
At this point you haven't told us or shown us what you have or what is wrong with it. We can't really help until we see pictures of the machine, and pictures of the damage.
