super h carb question

My 53 stage 2 super h starts very hard after sitting for a few days and even hard when warm. I MUST keep the throtel all the way to lowest rpm and PUT my hand over the carb intake to "prime it" the take my hand off and let it warm up at low rpm, AFTER that it RUNS great at 800 to max rpm but has some studdering from lowest rpm to the upper rpms. When i first got the tractor all i had to do was look at the starter and she would go even will little or no choke. I thinking i have a crud in one of the little "worm holes" but what i dont get is Why wont the choke be enough to get it "primed" to get it started. If seen a few dirty carbs where you need the choke out to run it, you take the carb off cleen it and your good to go. I also checked the intake foe leeks and are none. 110 lbs across all 4. I guess i just never ran into this kind of prob before and hate to take the carb off if its somthing els. adjusting the carb does no good. Any ideas Welcome.
 
Try tweeking the float,seems like the level is not right,my C did the same thing now it starts with no choke I need to go back alittle.
 
Either an air leak somewhere or a dirty carb. I would have suggested checking to see if the choke butterfly has come loose from the shaft and is not closing off the air passage, but that would have little to do with the rough running after it finally cranks up.
mike
 

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