No doubt about it with "single caliper on front of left leg 3 screws on left cover, manual fuel tap, single bolt foot rests, round master cyl" it's a 1977 KZ650-B1. The starting frame number for the 1978 KZ650 was 027501. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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