Ok so I just got the bike had it about 2 weeks and it just kind of hit me that the bike might have a Idle problem. Best way I can describe it is, when I first start the bike it cams, the bikes idle jumps about 200 rpm then back down like small little revs. I let the bike warm up under idle and it still does it. Now when I ride the bike for about 20 min it stops. Ive tried to turn the Idle adjust screw but it didnt want to turn so I stoped not wanting to break it. Should I take the bike into the shop or just not worry about it?