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4040 carb question


TFF

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My 4040 has been losing power under load. I'm pretty sure I've narrowed it down to the governor springs. My question is about the carb...I have a CCKA engine with down-draft, but where the main fuel adjustment is supposed to be, there is a slotted brass plug. Same thing is on my parts tractor carb. I can only adjust the idle?

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Thomas are you sure it's just a plug and you remove to adjust? I've never seen one in person. Couple more pictures

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