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CRF 450R not running without choke on

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2002 CRF 450R running smoothly on the choke but as soon as i take it off it back fires and it can't keep an idle.

Any ideas on what i should do?

thanks

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may or may not work but i will throw it out there... my minibike did the exact same thing last week and it was the spark plug.. worth a try at least

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Check the pilot jet. On a two stroke, if the bike only runs with the choke on, it is a sure thing that the pilot is pligged.

When you reassemble the carb, be sure to put the slide back together correctly. I have read in here, multiple cases of part of it going in upside down.

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dude i had the same problem. It drove me nuts. Its the pilot jet. spend the 3 bucks and replace it

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what do you mean pligged?

He meant plugged, as in clogged, obstructed, something in the way.

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