ROTAX 912 Support
ROTAX 912 / 914 Mag Drop Troubleshooting
For ROTAX 912 / 914 excessive mag drop, rough running during the ignition check, hard starting, or rough idle concerns.
What You May Notice
Record the Behavior Before the Details Blur Together.
- Rough running during ignition check
- Excessive RPM drop
- Left/right drop difference
- Hard starting or rough idle
- Heat-related behavior after the engine warms
What It Can Involve
Several Systems Can Create the Same Complaint.
- Plugs, plug caps, and ignition leads
- Carb balance or intake leaks
- Ignition modules, wiring, or grounds
- Fuel quality or stale fuel
- Recent maintenance quality or incomplete records
Mag Drop Review Focus
The Check Result Needs Its Operating Conditions.
A mag drop number without RPM, temperature, fuel, idle quality, and recent maintenance context can point the review in the wrong direction. The left/right difference matters, but so does when the roughness appears and what changed before it started.
Why It Matters
Ignition is Only One Possible Path.
Plug condition, caps, leads, module behavior, carb balance, intake leaks, stale fuel, and ground or wiring issues can overlap. The review keeps those possibilities separate until the record and observed behavior support the next step.
What Information Helps First
Keep First Contact Simple and Useful.
Start With the Facts
Send the Aircraft, RPM Drop, and When It Happens.
A mag drop is not a conclusion by itself. Send the aircraft, engine model, left/right RPM drop, check RPM, and whether the issue is hot, cold, or intermittent.
Send Aircraft Details