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Z1 KZ900-1000 Tune Up Specs
Carburetor Settings | Tuning Tips | KZ900 Factory Tune Up Specs| KZ900 Parts Manual

Spark plug type
NGK B8ES (Normal), NGK B7ES (below 50° F, 10° C)
Gap: 0.028 - 0.032" (0.7 -0.8 mm) for all Z1, KZ900, z900, KZ1000, LTD models 1973 - 1980

Idle Speed
1000 cc (1000 RPM)
900 cc (900 RPM)

Valve Clearance
1979 & Later models: 0.002 - 0.006" (0.05 -0.15mm)
1973 - 1978 models: 0.002 - 0.004" (0.05 - 0.10mm)

Also see, KZ900 Parts/Specs/Ref Manual