Hello, my friend has a go-kart that I know very little about, but he doesn't have acsess to a computer with internet so I will say all I can about his problem. His machine ran fine up until a while ago, and it began to lose power. He now guns it and it inchs forward and backfires and stalls. He has cleaned and flushed all the fuel lines and the carburator, and doesn't know what to do next. He improvised an exhaust after his other one ruptured, and it is a straightpipe. I know nothing more about the problem than this, and if anybody has any suggestions about this topic it would be very very helpful!

 

The engine and clutch might not have enough torque to get going with him in it,and the engine might just be worn out.