Hi Norm, these things are a knockoff of an ef2000is yamaha.

The chinese seem to have good taste as they either knock off the old honda eu (gentrax, mickeyblu gensets) or these yamaha (kings 4x4, repco, supercheap and full boar all sell these around the 2000w mark)

Its the little stepper motor assembly that sits atop the carby, a little cog in it cracks in half and its all downhill from there.

one of these little buggers i think https://www.aliexpress.com/item/1005004910520209.html