02 yz250f has hard spot in it turning it over?

My son was riding his yz250f yesterday and it quit on him, said it was hard to kick at first and then started and quit. I checked it and it started right up, but when i shut it off it stopped right now, and i pulled in the decompresion handle and turned it by hand and got a spot that was kinda hard. I tried it again and got it to do it one more time. I was thinking timing chain maybe is getting bad and kinking? Anything else? Thanks!

Yes, if the cam tower bolts are cranked down too tight, the cams can sieze causing it to stop something like you describe. Did someone adjust the valves lately?

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