2010 yz250f doesnt want to run

rode the bike about a month ago and cut out and wouldnt start.so left it and kicked it last week and it started almost straight away and seemed to idle well. then i rode it and it would bog down low also if i shut off coming into a tight corner it would cut out. i have tryed adjusting the air fuel mixture screw and it would start fine but then cut out as soon as i touched the throttle. it then would not start until i adjusted the screw some more,then cut out when i tried to rev it, so now the bike wont run atall.. 

 

any ideas what it could be?

Bad spark plug

Clogged tank vent

Debris in carb

bought a new spark plug today, will clean carb and have a look at tank vent

cheers

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