The bike runs fine and the idle speed was a little fast when I bought it. I've slowed it down since but not adjusted the screw. I have had the carb off and set it all up as it should be and the jets didn't seem blocked. Not yet ran the bike as the fuel tap was broke and just kept flooding the crank out. Hopefully will be sorted now. I'm going to undo the screw and see if it stops it running rich and smoking as much