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I have a 2002 XR 400 that I have had for a few years. just recantly it has started to cut out really bad. I have a K&N air filter but that is the only after market parts. I have considered new jets, does anyone have recomendations for this annoying problem?

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That's not a lot of info to go on.

Just recently, as in, after it has sat all winter with old gas in the tank and carb?

Done any other intake or exhaust mods? Before you consider new jets, you need to know what's in it now. And the XR can be difficult to jet properly if you've done airbox/intake mods but done nothing to the exhaust.

Could be the plug needs changing. Dirty/varnished up carb and jets. Float out of adjustment.

Your elevation?

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