These are the tune-up specifications for the Honda Z50A. The source of this data is Chilton's Honda Singles Repair and Tune-up Guide, 2nd ed. This book covers models made between 1968 and 1975.
| Ignition | ||
| Standard spark plug | C6H | NGK |
| Spark plug gap (in./mm) | 0.024-0.028/0.6-0.7 | |
| Breaker point gap (in./mm) | 0.012-0.016/0.3-0.4 | |
| Valve clearance | ||
| Intake (in./mm) | 0.002/0.05 | |
| Exhaust (in./mm) | 0.002/0.05 | |
| Carburetor | ||
| Pilot air screw (turns out) | 1 1/8 | |
| Float level (in./mm) | 0.7/181 | |
| Idle speed (rpm) | 1400 | |
| Cranking compression (psi) | 170 |
1 = K3~ : 0.65/16.5
2 = Keihin : 0.78/19.5 - Mikuni : 0.95/24.0
3 = CT90 : 0.85/21.5 - K1 : 0.94/23.5
