2010 crf250 runs fine with choke , stops with out choke

Hi ,new here, have scrolled for answers but have come close but not successful 

Problem is 2010 crf250 starts fine , runs no issue with choke on ,once choke is off it randomly just stops like kill switch been hit. Kick it again and starts . It’s like the idle drops / lack of vacuum…. If idle is high it’s fine but not ideal to ride.

Have tried different fuel tank / fuel pump , coil,spark plug,complete throttle body ,stator ,flywheel ,camshaft,wiring loom,checked valve clearance, cam timing, checked piston and rings

What am I missing 

Thanks in advance 

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