A represents 1980 frame. NOTE ,a lot of 80 model frames cracked or broke if jumped hard , kawi even offered a gussit kit for these models . the 81 model had extra gussits , kawi even had 2 different frame numbers options for these models trying to correct it, they were slow learners as i saw they had a kawi bullutin for 1984 kx125 with a gussit kit and were to strenthen the frame .