Hello. So I have a 2005 Drz125l that I recently got off of my cousin. He recently put a brand new carb on it. Yesterday I rode it for 4 hours and it ran fine. Today, I tried to ride and when I did it seemed to bog out and it would stall and I would try to start it again but it wouldn't start. Then when I did get it started after an hour of trying to start it, I could finally start it but it only ran with the choke completely on. I looked online and at my carb and it doesn't have a air screw or fuel screw. The carb seems to be a Mikuni Vm2055 The only thing I did this morning was adjust the idle speed screw. It's a brand new carb so I have no idea what's going on. Please help me.