And it'll round the angles off of the shaft hex or octagon used to move the rubbing block, and ruin it, in a hurry. The same goes for lithium grease; these all cause severe metal surface wear when rubbed between parts.
But it sounds more like fuel delivery. I would start with checking the float level, doing a wet float test if it is a 1920. The float level effects all other carb operations except the accelerator pump and can cause hesitations if low.
