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I think z50kid is on the right track if you didnt put that black spacer in, it would cause the carbie to get hot (heat transfer from the head) which in turn boils the fuel in the carbie and you get vapour lock. so it would ride fine when cold and the second it gets hot backfire miss and cut out.

If you've got no spark it must be the coil it only takes a hair line crack (on the coil) for water to get in and its stuffed.

Hi sounds like either the float is full of fuel or the needle valve which the float operates is jammed or just stuffed.

sounds like you've got an air leak (sucking air past the carbie not through it) did you replace the gasket at the two bolt flange where you removed/replaced the carbie.