I am glad you bought that engine, I looked at it before going with a Listeroid. It's nice, really nice, and it needs a good home. The voltage on the generator was a little low for my intended application, I did not dig around in the genhead doghouse but I suspected it was wound for 3 phase and I really needed single phase at this point... I may move up if the research warrants it.
But I found nothing wrong with the engine at all, and you got a good deal if you have an application.
The other reason I shyed away from the Witte (and I love em) is that for a primary power supply off-grid I will need to stock a full complement of parts... And spares of things like injectors and pumps were simply not to be found.