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2003 KLX400SR backfire no idle

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I've read so many posts on this and they seem to say clean the carb. Well, I've had the carb off 3 times and cleaned it. Taken every jet out, cleaned all the pathways. I never did see anything clogged. Bike still will not idle w/o being choked. It also backfires at a constant throttle. This all happened after sitting over the winter. I would think something was clogged, but no signs of it. Also ran SeaFoam through a tank of gas. Same result. Not sure where to go next??

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Replace it with a new stock jet or an aftermarket of a different size? No mods at all to this bike. Thanks

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or the passageways of the idle circuit rather than the actual jet.

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Boot looks ok-thanks. I think I'll give one more shot at cleaning things out. Probably let the whole darn carb sit in cleaner over the weekend in case it is in the passages!

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You know, doing the same thing over and over and expecting different results is not sane. Save the time and effort and simply put in a new pilot jet.

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or the passageways of the idle circuit rather than the actual jet.

This is where I would look. I went thru the same problems 2 years ago when I bought my bike and one of the passageways was plugged.

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Well, after soaking the whole thing for about 2 hours and blowing everything out with the air compressor, paying special attention to the passageways, it seems pretty good! I drilled the plug out to get to the a/f adjustment and with it about 3 turns out I think it's much better. Thanks for your help.

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