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Fuel mixture

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Hey guys I'm kinda new to the dirt bike world, I've ridden bikes my whole life but they've been friends extras. I recently bought a yz426 and I was wondering if the idle screw is the fuel mixture or is there another place on the carb I can tweak the mixture with out jetting it because my 426 starts 1st or 2nd kick every time but it dose run just a little rich

Thanx in advance

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