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I've had a problem that started with my 2005 ltz400, It only idles with the choke on and as soon as I take it off it just dies. I thought maybe it was just old gas but when I changed the gas and spit all the old stuff out and it still does it. I even messed with the idler. Can anyone give me some good advice? I'm a newbie rider and it's a used bike and don't know much about how to fix little things.
 

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It could be the carb or petcock on the tank. Mine was a petcock problem. Be careful your bike mat run lean. I am running mine on PRI right now until I replace the petcock with a Yamaha Raptor 660 petcock. But do a search z400central has a lot of info also.
 

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try primary jet this runs the bike at idle . main jet is midway and top end. also could be feul air needle adjustment i believe it to be about 3 and 3/4 turns out from closed.
 
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