Re: can this be fixed
I'm sure it can be fixed..... but at what cost. I've sealed cracks in cylinder head water jackets in regular automotive engines with epoxy ( J B Weld ) and gotten many years of use. To have it welded, it may be kind of pricey if you include your time to pull the power head off. I would try the epoxy route first. Clean all the paint off from around the crack and roughen the surface up a bit so the epoxy has something to stick to. Clean the area with some carb cleaner. As long as the crack is not is an area that is under a lot of stress, you should be OK.