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Carb issues

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Hi, my 2003 wr 250 isn't running correctly and uses to much fuel. I have taken the carb off and cleaned all the jets but it has made little difference. First of all it won't start without choke even when warm and if you snap the throttle open it will bog down. Does any one know what position the blue thumb screw needs to be in, it has numbers on it 1234???? Thanks in advance.

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Two, things:

1. sounds like you have an accessory Fuel Screw, with numbers on it.  Should be 2.5 turns out from fully closed.  NOTE: if it is ALUMINUM, it may be trash and cause your problem.  If its been run in tight bottomed out, it could break off the tip in the small hole down there.  Also, the aluminum ones don't have a sharp pointed tip on them, which makes it nearly impossible to tune properly.  Recommend getting a Carb rebuild kit that includes a new fuel screw.  When you close it and start your count out, just turn it until it bottoms, don't tighten it. Count in 1/2 turns out to 2.5 turns.  Use William1's fuel screw adjustment procedure.  Search it.

2.  sounds like your pilot jet is clogged up.  you can clear it to test it by running a small guitar string thru it, or a small wire from a wire brush.  But when you get a new rebuild kit, it should have a new .40 pilot jet.

Beyond that, double check your float bowl height, make sure its in spec.  And set your slide height to 1.25 mm .049"

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