Hi, I have a pair of old klt 200 three wheelers that I bought for $30. Both are in good shape and run. I am having problems with one though. I know how to work on 2 strokes but have not ventured into 4 strokes much! The problem that I am having is that one of them does not want to idle very well. I turned up the idle screw till it idles great, but then when I drive or rev up the motor the idle stays way high so I back the idle screw back down and then it doesn't want to idle well again. I have cleaned the carb, and jets. Adjusted air screw. Checked compression (150psi). And looked for air leaks, spraying carb cleaner around carb and boots and vaccum hoses. I have put on a new electric fuel pump also. Still can't get it to idle right. Could valves being out of adjustment cause this problem? I am out of ideas. Like I said, I am only familiar with 2's and not 4's. Any help would be great! Thanks, Preston

 

had a bike do that once and was cause of the valves were to tight but it only did it once it warmed up not when cold

 

It mainly does it more when it is warmed up.