This one is a 125Z(1982)Many parts are interchangeable.Carby,radiator, reed block,head, barrel can be used on D with only minor porting changes-(81-84 were all same bore and stroke),but81 and 84 were case reed induction,while 82 &83 were like the one in the picture.The centre cases on the 81,82 &83 are all different as the crankshafts are all different.The 83 was the first of the 125 RM's with compression adjustment on the reservoir.The 83 swingarm is longer than the Z swingarm but otherwise identical.Really there is no notable difference in the airboxes.The 83 chamber and silencer is different to the 81 &82 which were interchangeable-I learnt these things from doing a ground up resto and am happy to help with info and parts if I can.PM me .
