What typical magneto issues are addressed during overhaul?

What typical magneto issues are addressed during overhaul?

• A. Worn impulse coupling, weak magnets, point wear, leakage; replace/repair and test (drop test).
• B. Worn or stuck carburetor throttle linkage.
• C. Bent pushrods and worn rocker arms.
• D. Faulty exhaust gaskets and intake leaks.

Answer: (A)

Magnetos are all about delivering a strong, correctly timed spark, and overhaul focuses on the parts that control that timing and the energy of the spark. If the impulse coupling wears, the timing impulse that fires the spark at the right moment can drift or fail, so it’s replaced or repaired. Weak magnets cut the spark energy, which makes ignition unreliable, especially under compression, so magnet strength is checked and restored if needed. Points wear or become pitted, changing the spark gap and leading to weak or inconsistent sparking; this means the points are cleaned, dressed, or replaced and the gap set to spec. Leakage within the magneto—whether oil or electrical insulation leakage—signals internal faults that can dampen or short the spark, so any leakage is corrected to restore proper insulation and performance. After these repairs, a drop test is used to simulate the shocks and vibrations of operation to ensure the magneto maintains timing and spark output under real-world conditions. The other issues listed—carburetor linkage, valve train components, and exhaust/intake sealing—belong to different systems and aren’t addressed by magneto overhaul.

Magnetos are all about delivering a strong, correctly timed spark, and overhaul focuses on the parts that control that timing and the energy of the spark. If the impulse coupling wears, the timing impulse that fires the spark at the right moment can drift or fail, so it’s replaced or repaired. Weak magnets cut the spark energy, which makes ignition unreliable, especially under compression, so magnet strength is checked and restored if needed. Points wear or become pitted, changing the spark gap and leading to weak or inconsistent sparking; this means the points are cleaned, dressed, or replaced and the gap set to spec. Leakage within the magneto—whether oil or electrical insulation leakage—signals internal faults that can dampen or short the spark, so any leakage is corrected to restore proper insulation and performance. After these repairs, a drop test is used to simulate the shocks and vibrations of operation to ensure the magneto maintains timing and spark output under real-world conditions. The other issues listed—carburetor linkage, valve train components, and exhaust/intake sealing—belong to different systems and aren’t addressed by magneto overhaul.