The Frame number of mine is KZT00D-0166XX and Engine number\nKZT00DE-0166XX but 1979 models numbers start at KZT00D-017501.\n\nQuick Facts: Do I own a 1978 or 1980 Z1-R?\n\n- Frame # by Kawasaki's #'s indicate a 1978\n- Engine # by Kawasaki's #'s indicate a 1978\n- White label next to Frame # on stearing head colume indicate's a\n1980 (11/79) but same white label also has the same # as the\nFrame that match perfectly. This shows the label was not taken off\nanother bike or the frame # would not match. Label looks original\nand aged as bike is.\n- Bike is physically a 1978 model with no 1980 changed features\nand NO Mk II 94 hp engine. (Bike engine also matches frame #'s)\n- Bike has been checked and found not to be stolen (also I'm told\npeople hiding identies of bikes alter the serial numbers not the\ndate of manufacturing). Unlike a car, the serial # of a bike is\nstamped in the steel of the frame (very hard to change unless you\nchange the frame and then the engine numbers don't match).\n- Bike is a North American Model.\n\nDetails:\n\nWho puts on the white label with date of manufacturing (Japan or\ncountry importing bikes)? Is this done at the factory or later when\nbike is approved for that country?\n\nI've contact Kawasaki about it. They don't know what to think of it\neither. It's not a D2 (1979) or D3 (1980) model because it don't have a\nMark II\n\nengine, 19 inch front wheel or any changes that was added to the 1979\nor 1980 models. Yes, I know people can change frames, engines, etc\nbut the #'s all add up to make this a 1978 model except the date of\nmanufacturing.\n\nThe Frame and Engine #'s put it as a 1978, the frame # matches the\nengine # so the frame was not changed and the label with the date of\nmanufacturing of 11/79 which is November 1979 (I said September 1979\nearlier but I\nwas wrong) also has the number of the frame that matches this frame.\n\nI've checked with other people to see if the label was tampered\nwith or the bike stolen and everthing checks out fine except the\nDate for the bike don't seem to match. What else could be going\non here?\n\nI would like to know from other owners of the 1978 Z1-R what\ndate of manufacturing they have on the frames. Do you know\nof anyone you could check and reply for them?\n\nKawasaki did confirm the frame/engine #'s on several internet\nsites as correct but also stated that there seems to be a high # of\n1978 models made and only 300 or less for 1979 models made. It looks\nodd to them. They did guess that the 1978 model may have been made\nup to 11/79 and the 300 bikes for the 1979 model could have been made\nin a month or two but they really don't know and the bike is old so\nthey don't have much info on them now. I doubt this is the answer but\nthey\nreally don't know what is the answer?\n\nWho would be a real expert to talk to on the 1978 to 1980 Z1-R bikes.\n\nWhat about an english contact from Kawasaki Japan? It looks exactly\nlike a 1978, it has engine/frame numbers that match it as a 1978 but\nit has a date of manufacturing of a 1980 (date of manufacturing label\nhas same number that matches frame).\n\nHere are some questions that may clearup the confusion:\n\n1.) What was the first month/year the 1978 models were made?\nWhat was the last month/year the 1978 models were made?\nExactly How many 1978 models were made?\n\n2.) What was the first month/year the 1979 models were made?\nWhat was the last month/year the 1979 models were made?\nExactly How many 1979 models were made?\n\n3.) What was the first month/year the 1980 models were made?\nWhat was the last month/year the 1980 models were made?\nExactly How many 1980 models were made?\n\n4.) Does the serial # include the month/year it was made?\n\nAny Kawasaki Z1-R owner data bases/registries on the Web\nwith serial # and date of manufacturing?\n\nThis is a real mystery here.\n\nIf I go only by the date of manufacturing it's a 1980 but I know\nthat's wrong in someway but how, should it read 11/77 instead of 11/79?\nWould a 1978 model be made from 10/77 to 10/78 for example\nor does the dates change from year to year so some models are\nmade from 10/77 to 11/79 but the next year may be from 11/79 to\n12/79, and the next 01/80 to 09/80, etc? Fixed or floating dates.\n\nIs the information incorrect about when the Z1-R changed to the Mk II\nengine and 19 inch front wheel, etc. so all 1979 and early 1980 models\nwere made like the 1978 model but sometime in 1980 they upgraded it.\nNo one seems to know much about the 1979 model of less than 300 made.\nWhat country(s) sold them? Would Kawasaki make less than 300 models\non a production run of a bike unless it's a special edition model? The\nproblem may be incorrect serial # info from Kawasaki and that the Mark\nII was\nnever made until after 11/79. Bikes made upto 11/79 was in the original\nmodel, then they changed over to the NEW Mk II model.\n\nThat could make more sense. It's a debate I'd like to find the answer\nto. Could Japan be the only source that would have the answer?