Over the last few days I have searched the forums and have done everything that was suggested. Heres the story, I built this bike a few months ago. It ran fantastic for the first few weeks, pulled me around at 35mph and I weigh 200. Than it slowly started running worse and worse. I have changed out the spark plug (was black and covered in oil), disasembled and cleaned every part of this terrible CNS carb (one with the sealed mixture screw). Changed out every gasket. Adjusted the clutch. Checked for air leaks. Checked all electrical connections. After all that it seemed to be running great. The motor was really responsive. I go to take it for a ride and it boggs itself down and begins to shake. I left it idling on the back porch while I went to the garage to get a jack stand. I come back to the bike and it is revving itself to death. Smoke pouring off the motor and exhaust. I checked the throttle cable it was fine. I fired it back up after letting it cool for a minute and it idled a little high. So I gave the screw an 1/8th of a turn and it fell on its face. I am at my witts end with this bike. Please any suggestions would be a great help. I know Its probably the carb at fault. But I just don't see how they can sell you a product that absolutely doesn't work. Thanks for your time!