Thanks Ade for the help!
To conclude the story - as I said before, it started up nicely and produced power. The second time I tried it, the engine ran fine but produced no output power from the generator. So I took it to a genny doctor friend and found it was only the bushes stuck, a little help with WD40 and all was well. He tried 3.5Kw and it seemed to run OK, so today I got it back home and I tried with 4Kw - the engine produced black smoke and started to slow down, so I will put a limit of 3Kw to err on the safe side for this generator. But now all is working fine, thank you. But if anyone has any spare part list for this generator, or a pdf for it it would be much appreciated. The engine seems quite easy to find parts here in the Falkland Islands, but generator appears a mystery to me.
Regards
Bob