A lot of the problem will be down to the lack of air filter. The air filter provides some restriction to the air flow giving more suck to the venturi allowing a richer mix.
Is the venti the same size on both mixers?
It is possible to adjust the fuel mixer, but i need to know what vapouriser you have. The main adjuster is in the pipe from the vaporiser to the mixer - on some systems this is electronic.
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