i have a 1973 suzuki ts 100 i know it sounds old but i have taken care of it. all of a sudden it has had a problem it has no torque to it to take of u reilly have to wind it to get it to go and then if you try to flick the throttle at all it well just pop and bogg down. so i have replaced the spark plug cleaned out the carburater put new oil in it and it still does it can anyone help me plz