I would like some input from those who know more than me about bikes. My '74 MT125 is struggling and I need some help with the diagnosis. It will start fairly easily although it helps to give it some throttle and it shouldn't need any throttle. After it begins to warm up it begins to struggle to keep running and you have to give it more throttle to keep it running. You may end up having to hold the throttle at 1/3 to 1/2 open to keep it running and it is miss firing all the while. You can't ride it because it will not make enough power to keep going and it will bog down and die. I have changed the gas and spark plug. Taken the carb off and taken it apart and cleaned it. I have a new air filter and there seems to be plenty of exhaust coming out of the pipe. I have noticed and thought it strange that you can take the slide out of the carb while it is running and it only runs up the rpms a little. I thought if you removed the slide while it was running it would run wide open. Could the reed valve be restricted and that somehow be the culprit. I can not get the cover off to check the points because the screw heads are messed up so I haven't checked the points. I hope I haven't left anything out and I hope someone knows what might be going on here. Thanks in advance for any help.