I own ke125 1981 same color red.next to new(yes next to new)1100 oringal miles heres the problem.I live in pennsylvania the hills here are steep.When you pull out in 1st gear and shift through the gears it falls on its face. backfires at times and just dies.let it cool and its fine for awhile. same thing will happen. change filter,plug being tolded its points where are they if its the problem (724 274 4523) help please thank you