While you have the unit apart, its also a good idea to have someone recharge the large horseshoe-shape magnet that generates the magnetic field created around the armature.Granted, the D had a battery and electric starter on it, but the fact remained that it could always be started by hand-cranking the engine, even if the battery was dead.I just knew I didnt need an electric current to get it started.
![]() Of course, the distributor portion of the magneto determines which cylinder receives the spark. However, there are some things you can check and replace yourself, including the points, condenser, rotor cap, and rotor tower cap. This is especially important since the magneto must initiate the spark before the piston reaches the top of the compression stroke. The result is a stronger spark for starting the engine and a reduced chance of kickback, which can occur when the spark reaches the cylinder before the piston has reached the top of the cylinder. Options for fixing this are to buy a new magneto or to send the magneto to a business that specializes in restoration. Next, ground the spark plug to the base of the magneto and test for a spark while rotating the drive lug. If its working properly, the coil can put out nearly 30,000 volts, which you will obviously feel. Basically, a spark tester looks like a spark plug with a large alligator clip. ![]() When the tractor is cranked, the tester will flash if you have sufficient spark. It can give you an idea of how well the unit is working and if the spark is hot enough for ignition. The other testing alternative is connecting a special multimeter that records and stores readings in excess of 30,000 volts. If it doesnt hold because the parts are worn, you wont have the whole starting circuit. The safer thing to do, if youve already removed the magneto, is to turn the lug backwards. As it rotates, you should feel a resistance at points 180 from each other as the rotor passes through the magnetic field. If theres a weak magnetic field or the rotor turns like its just rotating on the bearings, it wont matter what you do to rebuild the magneto, McWhorter says. So if the specifications call for a spark plug gap of 251,000, the spark should jump inch. Plus, it should be a deep blue color not red, yellow, or orange, he says. Youll also want to inspect all the gaskets and insulators that isolate the generating components from the body of the unit. This especially applies to any bolts that protrude through the magneto body. Any voltage leakage can ground out the unit and make it ineffective.
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