Dirtbike revs high only when choke off

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Feb 6, 2021
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#1
I have an Assassin 140cc dirtbike, was riding it and it was fine then after I realised a screw off the carb bowl fell off (I have since replaced the screw), although now whenever the choke is off the dirtbike revs extremely high, and when the choke is on it revs a little higher than normal.

I was wondering if it could be an air leak? I’ve taken a fair look around the carb and the things around it but can’t see any cracks. Could an improperly placed gasket make this much of a difference? Any help is appreciated.
 

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