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This engine uses a carb with a float bowl. The carb has one main fuel metering orifice - the main jet. It is a brass piece that screws onto the bottom of the float bowl. It has two holes perpendicular to the main hole. The two small holes take fuel from the float bowl and transfer to the large hole that feeds the body of the carb (and into the intake of the engine). I see no other means of changing the amout of fuel to the engine, so that means that it is working on vacuum pressure. The more you open the butterfly, the more vacuum you create and you should pull more fuel through the main jet. Unfortunately, this calibration appears to be off on my carb. I was able to get it to run, but I had to toggle the choke while I manually adjusted idle (butterfly) - really high. By doing this, I was able to get it to run. The problem is you can't slow down to an idle and I almost smoked new clutch on the cart! I have soaked the carb in carb cleaner for days, blown it out with compressed air and even ran a tip cleaner through all of the orifices. Still no change! Any help would be appreciated.