KZ/GPz Carburetor spacing.

can anyone tell me what the carburetor spacing is on the 550/4 engine? Center to center dimensions?

Otto

I'd have thought the same as the 500.
Same carbs you see.

I can check when I get home. The 550 line had several different sets of carbs, but I think the center-to-center spacing remained the same even though the port diameters increased over time.

550:
KZ550A-standard (except the last year), KZ550C-LTD, and 81 KZ550D-gpz all used the TK22 rack.

The 82/83 KZ550H-early Unitrack-gpz550 used the TK26 rack.

The 84-up ZX550A-later Unitrack-gpz550 used the TK27 rack.

The KZ550M-shaft LTD and KZ550F-Spectre used some form of TK26 or TK27 rack.

I know the TK26 rack has same center-to-center spacing as the TK22 rack and the TK27 rack so it looks like all 550 motors have same spacing.

The KZ500's used the TK22 rack and the KZ400-4 used the TK21 rack which looks the same as the TK22 rack so those motors probably use the same spacing (the motor castings seem identical to the early KZ550 A,C,D castings).

They won't line up with the 650's though.

I measured two sets of TK22 racks. Both were the same.

1-to-2 center-to-center was 71mm.
2-to-3 c-t-c was 92mm.
3-to-4 c-t-c was 71mm.

All bores are parallel (not splayed outward), and all mouth openings are in the same plane and the centers of all four mouths form a single line.