Re: I need help with this one!
If it will only runs with the choke set to full, it sounds like an air leak somewhere in the fuel system to me.
You did use a new manifold gasket, seal up the tube where the carb attaches, If so I think you might want look a the head gasket and the butt gaskets as well.
I'm sure some of the guys will know more but that is where I would start.
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