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How to Bench Test a Magneto

When a high-tension ignition engine won’t start, it’s common practice to pull the spark plug, lay it on the engine, turn the flywheel, and look for a spark. If it sparks, I often hear, “Maybe the mag is weak and won’t fire the plug under pressure.” If that statement is correct and pressure effects ignition greatly, what can I do to ensure the magneto is OK? The word ...

Staff

Gas Engine Magazine

Preserving the History of Internal Combustion Engines