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Which engine and carburettor have you got? From the suddenness of the problem, it sounds like a partial blockage, so here are some generic thoughts:- Check that you don't have any air leaks (manifold gasket, carb to manifold gasket, throttle spindle) Check that the float in the carb is operating correctly, and that there is enough fuel getting to the carb. Check that your fuel line is not partly blocked, and that all/any filters are clear. Check that your air filter has enough clean oil in it (too little oil will make the mixture weak). I would not adjust anything on the carb until the above has been checked - tempting though it is to assume the carb is the problem!! (who, me, make that mistake, no, never, honest guv) Then check that you don't have a partly blocked main jet (unscrew it completely, and use a bit of fuse wire to clean/clear the jet orifice). Hope this helps.
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