Bike won't start and stalls when roll start

Hi guys I can never start my yz 250f 2003 and ideas on why or Andy tricks to getting it going

Have you tried a new plug?

Yes

Could be in order of likely. ...

Blocked pilot jet

Bad fuel

Fuel screw adjusted wrong

O-ring dead on fuel screw

Choke plunger jammed

Hot start plunger jammed

Dead ignition/ bad stator

Have you checked valve clearances they get hard to start when clearances close up also test stator for a fault

start with the basics : fuel? Spark? Compression?

When did it run last?

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