| 4M | Q-Jet with manual choke |
| 4MC | Q-Jet with carb mounted automatic choke |
| 4MV | Q-Jet with divorced automatic choke |
| 4ME | Q-Jet with carb mounted electric choke |
| M4MC | Q-Jet (Modified) with carb mounted automatic choke |
| M4ME | Q-Jet (Modified) with carb mounted electric choke |
| M4MEA | Q-Jet (Modified) with carb mounted electric choke (Altitude calibration) |
| E4MC | Q-Jet (Electronic) with carb mounted automatic choke |
| E4MV | Q-Jet (Electronic) with carb mounted electric choke |