Locked up Yz 125

So I ride my yz125 all the time and my oil over flow bolt fell out and i stopped riding until i found another one. I had to buy another one and put it on. I put oil in it and now it wont kick over. I opened up the head of the motor and it looked fine. i dint have enough time to get cylinder off. I can crank over but its making a a bad noise on the bottom of the motor. I think its barrings but i dont know. Any help????? 

Edited by Itry

I'd open it up it sounds like it's time for a bottom end

Was it running without oil in it or was just the bolt missing.  Can you kick it or is it completely seized.

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