Most small lawn mowers, chain saws, trimmers and other small gasoline engines do not need a battery. Instead, they actually generate the power for the spark plug using a magneto. The voltage causes a spark to jump across the spark plug’s gap, and the spark ignites the fuel in the engine.Click to see full answer. Similarly one may ask, how do you check a lawn mower Magneto? How to Test a Lawn Mower Magneto Spin your flywheel. If the flywheel is too far from the magneto, your magneto won’t be able to generate enough currency to send to the spark plugs. Look for missing magnets. Perform a spark test. Similarly, what does a magneto do? An ignition magneto, or high tension magneto, is a magneto that provides current for the ignition system of a spark-ignition engine, such as a petrol engine. It produces pulses of high voltage for the spark plugs. It is also widely used in aviation piston engines even though an electrical supply is usually available. In respect to this, how do I know if my Magneto is bad? The spark plug is fouled and shorted to ground or is open and the magneto, which is functioning normally, is unable to fire it. A typical bad plug will cause an immediate drop of 250 or more RPM, at the mag check. The key indicator is the suddenness of the drop. You have tried leaning and cleaning the plug to no avail.What causes a magneto to fail?A magneto exposed to very high temperatures, may also cause the dielectric in the capacitor to break down. This can cause a partial short between the plates which can lower the voltage in the primary coil. Signs of high temperature on the contact spring or severe breaker point erosion are signs of a failing capacitor.
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