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Fuel screw keeps coming out

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I just picked a crf 150 r for the wife but I have to back the fuel screw so far out at least 3 to 3.5 turns to even get the thing to run half way decent. I had to order a new setup today because it just fell out I think I had it backed so far out it just fell out . any suggestions on how to jet this thing so I dont have to back the screw so far out and are there any aftermarket screws that are easier to deal with thank you

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u need a larger pilot jet...turn the fuel screw all the way in ....then thurn it out, to richen the mixture....if the idle smooths out and u end up going out more than 2.5 for a keihin FCR carb...u need a bigger pilot jet...if the idle gets better with less than like 1 turn...u need a smaller pilot..

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