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Enrichment as in choke. Some carbs restrict air some add fuel. Either way it's to alter the stoichiometric ratio of fuel and air

I have an old JD AMT 625, given to me by my dad. It starts and runs well, but only if you leave the enrichment circuit open for what seems like eternity. I'm planning on re-gifting it to an elderly lady for her gardening needs and want it to run well. My question is, what causes this...