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Have you checked the kill wire? Disconnect it an try engine if it starts you know mag is working. Have you checked plug? Also check plug wire? Also are you talking about older mag with points?
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bob, i believe the magneto only charges the battery, if you have weak or intermittent or no spark i would look at the spark plug or the coil as the coil is what causes the spark. if plug is weak, the coil is bad or even the wire on the bottom of the coil. it is a ground. unhook that and see if it has spark. if it does the coil is your problem. good luck
The spark on the 25 hp Kohler is Magneto. There is likely an interlock to the PTO and Seat safety interlock. The magneto appears in some lawn garden applications to be connected via the safety interlock?
So when the engine turns the magnetic field of the flywheel activated the engine spark but if the interlock safety switches are not enabled the spark the magneto is disabled resulting in no spark. A lost spark is likely a defective or corroded switch.
Are you sure you had spark before you took it apart? If you are not sure, then the Ignition Coil may have went bad. How did it act before you decided to take it apart?
that could be from a short in the circutry even as simple as some debri build up around the blade brake magneto ground contact point that is grounding the magneto so spark can not continue to the plug could also be a fouled spark plug or could also be the magneto condenser attached to the magneto has burnt thus looseing capability to disperse the electrical energy to the spark plug, and worse case senario is the magneto is internally damaged from use also possably the magneto's air gap to the magnets on the flywheel is to exssesive for energy production hope this helps Steve
The spark comes from the Magneto. Follow the spark plug wire and you will find the magneto at the end of it
The first thing you should check though, is the safety kill switch. There is a pressure switch in the seat that kills the engine in the event the driver falls off.
You need to be sitting on the mower to start it.
If the switch is ok and you still get no fire, it's the magneto.
check the gap on your plug. .030 is what it should be. also make sure that your kill cable is working properly and not grounding the engine out. the gap for you magneto should be set to .010 to .012 loosen up the magneto insert a standard business card or 3x5 card then turn the flywheel so that the magnet on the flywheel pulls the magneto into it. then tight the magneto mounting screws down. try spark now. always use fresh gas. -no-water- if in doubt throw it out. gas is BAD after only 30 days.
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