Yz250f won't start!

I've had this 09 yz250f for about 3 weeks and it has been running and starting perfectly until yesterday when It was starting first kick until it got hot and I had to bump start it, but it ran perfectly after that and just wouldn't kick start after I turn it off. Today I started it cold first kick and after riding it for 5 minuted I turned it off a d couldn't start it again. It won't even fire. I think it might be the spark plug because I moved around the lead and it fired a tiny bit but still won't start. The valves have recently been done so the clearance wouldn't go out that quickly would it? I don't know that much about it so please help. It has also recently had a new piston and cam chain so the engine is fine but it might just be something simple.

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