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the same thing happened to me its probably your valve clearance and need to be shimmed or if they worn really bad they need to be replaced..regarding roll starting your bike it damages your bike further and your engine could seize.
Not sure of the age of your YZ 250 ( You never said!) but in most Yamaha they use dual stage stator which means a stator will charge a spark plug at two speeds one on kick starter speed and the other on running speeds it is common that the low speed circuit on the stator to fail leaving you with a bike that only starts when pushed its a very simple test to diagnose it be worth checking you have spark on kick starter speeds with spark plug out the motor but still connected
Just remove the right side cover to expose the kick start mechanism. Remove the bolt on the end of the shaft, tow washers and guide then the spring. It has been awhile since I worked on the KX 250, but as I recall, the clutch does not need to be removed in the process of replacing the spring. I could be wrong on that. Below is the kick mechanism on your bike. Please rate my answer. Thanks.
Don't know this bike but I've only owned kick start HD'd.They work the same.The free easy crank on the kicker is the cylinder geting to the point of compression.The hard point is when you're there.Use your power and kick it!.Repeat if it don't start get to the hard point and kick it!..Make sure your gas valve is open and key on.Don't give it too much gas.If it don't start it's either Gas or Spark.Good Luck.