There is an alternative for that “just once in awhile” coil tester. Wear leather work gloves throughout this process to protect your hands and the sensitive parts of … The amount of dismantling required to expose the coil housing depends on the lawn mower model, but it's usually little more than removing four or five screws. Beware of resistor or non metallic wires, they are a big NONO with early magneto ignition systems as are resistor plugs. The equipment involved is often out of reach of the typical home outboarder. Then start the engine and watch the tester window. Start with the red (medium grit) and finish with a fine. Set the multimeter into the ohms function, or just use an ohmmeter. This indicates an internal short in the magneto. This indicates an internal short in the magneto. Presence of spark at the spark plug in open air is not a valid test as it does not accurately emulate the effects of the fuel/air mixture and compression.Air is normally an insulator but if we clobber it with high enough voltage it will break down as an insulator, ionize and conduct electricity. Testing the Coil or Armature. The best RX is to get the contact surfaces smooth and shiny. Weak spark issues like missing under load or at high speed are a bit more complicated and will be addressed later. Check with your boat or small engine repair shop to see if the magnet can be recharged before replacing the magneto. Condensers almost never change in value but this is a good way to tell if the device is open or intermittent by performing the test and moving the leads while watching the meter. Insert it into the … Here we will share some basic testing and troubleshooting gleaned over many years and beers from college professors, farmers,mechanics,coworkers and the college of hard knocks. From United States +C $23.08 … How do you test a magneto? Most of the work we do involves magnetos as fitted to Veteran, Vintage and Classic machines. Magneto Output Test To easily and cheaply test your magneto's output, the document to the right will give you a good idea of how well it's working. Measure the distance between the flywheel and the magneto; it is usually set from.010-inch to.012-inch. A good condenser will show a brief inrush of current till the device is fully charged then drop to zero. A defective device will come to rest in the red portion of the scale on the right or peg to the right. Remove the engine cover, locate the kill wire and unplug it first. Buy It Now . As the flywheel turns, the magnet spins around a transformer with exposed copper wire windings, inducing a current which fires the spark plug and ignites the gasoline. Testing the Coil or Armature. For tractors this is a good ballpark target. They also are common in antique motorcycles. Locate the magneto. Goat 9,471 Posted May 20, 2013. The way you test your magneto is like in the video, by testing the resistance and comparing it to the spec in the manual. Goat . Small engines can get away with less spark output. It is the only part that has exposed copper windings. A fouled plug can short out the spark and not look dirty. Here is a brief glimpse of some ignition service equipment. The condenser is a device that stores electricity. Reinstall the coil of your chainsaw after replacing it if needed. Simplicity; The Wiring in the Coil Ignition System is quite complicated hence this system requires greater attention against possible defects. Smooth contact surfaces will stay clean longer than rough. Replace the magneto if the meter reads "OL." A leaky device will show an inrush of current but will never drop to zero. Share Followers 0. Usually there are three bolts on the shroud, but some engines made in the mid-1970s have four bolts. If the points are clean and it is still a no go the next step is to check the condenser(capacitor for the electrical engineering types). Do not use auto ranging, as it is unreliable with a magneto. Some magys have a spark-gap built in to obviate this. American Bosch uses similar specs. Here is a vintage Wico (Mercotronic model 60) tester. If no buzzing is heard, either the vibrator is inoperative or the circuit from the “OUTPUT” terminal on the vibrator to the switch and magneto points is open. If the spark jumps the tester gap, your ignition coil is working fine. So, Here it comes Comparison of the Magneto and Coil Ignition Systems. You can get zero reading none if hooked to points and they are closed. Clip one end of the spark tester (service part number 19368) to the ignition cable and the other grounded to the cylinder head . it will drive base or flange mounted magnetos. Step 2 Place the red lead from the ohmmeter on the positive (+) terminal and probe the coil mounting bracket with the black lead. Readings are given in thousands of ohms, or "k" ohms. Step 2: Spin the flywheel rapidly (at least 350 RPM) and watch for spark in the tester window. Remove the two wires from the coil using a small electrical wrench. Step one is to test the magneto as a system with the Allen Electrical Servicer then if faulty identify and correct the defective components. Check the connection of the high voltage, or HV, wire to the coil and to the spark plug clip if you obtain a reading higher than 15 k. After making sure the connections are clean and unobstructed, retest. Often it is not a magneto issue at all. Trying to fix a Fairbanks Morse magneto Mark, I guess you had the coil out or coil wire off the points and condenser. Reply to this topic; Start new topic; Recommended Posts. Replace the magneto if the meter reads "OL." Wear rubber safety gloves when working with any sort of electrical wiring. JW² ***** We have a great online selection at the lowest prices with Fast & Free shipping on many items! Magnetos are most common in small outboard motors. Carefully pull the coil off the bracket, and then carefully disconnect the engine and vehicle wires from the coil itself. The large device on the far right is a 1947ish Allen electrical servicer. Manually set the dial or button on the meter to the 40 k range. This is helpful to detect a miss from a short or leakage as well as how hot is hot enough to perform adequately by adjusting the widths of the spark gaps. Application Info ala 1948 Or What Fits What?? Step 3 Attach the ends of a multimeter to the coil connections for input and to ground, testing electrical resistance in the unit. Testing a magneto. A good reading will range from 3 k to 15 k. A higher reading indicates a poor connection.
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