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04 yz125 jetting/ random problem

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My Yz has been running fine all summer untill the past few months. It's started to run rich and I'm fouling plugs left and right. I've used the same oil (Yamalube) since I've had it. It's very smokey now but when it's warmed up after 10 minutes of hard riding it does not feel as rich but still smokes more than it should.

Another problem is that when it's warmed up it will not idle, even when I play with the idle screw.

I always clean my air filter and change my fluids so I'm stumped.

What could be the cause of this??

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