It shouldn't be too hard to tell if it is a 78 or an 80 motor. If you have the 80 that would make it a MKII motor the engine covers are much different. The trans cover curves are more angular and the clutch adjustment cover is not tear drop shaped. Also the 80 motor would have the pollution control valve cover where the 78 would not. Here is a link to a pic of the MKII engine in my 80 1000 G-1.
kzrider.com/index.php?option=com_ponygal...&func=detail&id=1499
Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special
