Idles with choke open but stalls on acceleration

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I've tried hammering on full throttle and it kills the engine completely. I'm guessing the fuel pump and fuel filter would be fine if it idles with the choke open.

I think I need to take the carbs out and see if the jets are blocked as I'm guessing if the idle jet is clear and air gets through with the choke open, but when the throttle opens it stalls, (and the air filter is brand new) it must be the main jets not supplying enough fuel.

Thanks very much for everyone's comments.
Last question before I take the carbs apart - are there any important gaskets/rings etc that need replacing on re-assembly if I'm stripping down the carbs?