My YS80 after only a handfull of successfull starts has started to rust !!

I first saw the rust deposited on a brand new glow plug, the plug was full of it ! i opened the head, ... more rust .. I flushed the engine with after run oil, and the oil came out brown and rusty, instead of clear and pink like before i put it in the engine. I have stored, maintained, ran the engine correctly, I have over a dozen glow engines of all shapes and sizes, i also fly gasoline engines and turbines .. I know what im doing here, and i know the rust is not something i did to the engine.... The thing has been a real b&%$ to start from the first place .. I am finding out how I can return this piece of sh#% and I will stick with OS like i should have ...
Wojtek