This is the most critical maintenance task.
If equipped, rotate the shaft by hand. You should hear a sharp "snap." This mechanism retards the spark and provides a high-speed spin for easier starting. scintilla magneto manual
: Includes the primary winding of the coil, the breaker points, and the condenser. This circuit "breaks" to collapse the magnetic field. The Secondary Circuit This is the most critical maintenance task
| Symptom | Probable Cause | Solution | | :--- | :--- | :--- | | | Broken impulse coupling (no "snap" sound). | Replace impulse coupling. | | | P-Lead grounded (Switch in OFF position). | Check wiring/key switch. | | | Wet points (oil contamination). | Clean or replace points. | | Hard starting (Hot) | Timing drifted. | Re-time magneto. | | | "Vapor lock" (fuel issue, not mag). | Prime/throttle management. | | Rough running at speed | Broken ground wire (P-lead). | Inspect wires for chafing. | | | Cracked distributor block. | Inspect block for carbon tracking/cracks. | | High RPM Drop on check | Fouled spark plug. | Clean/replace plugs. | | | Magneto timing retarded. | Re-time the magneto. | : Includes the primary winding of the coil,
Modern mechanics often approach vintage magnetos with modern electrical logic—and fail. The Scintilla magneto operates on unique principles: