be connected to the WHITE from the tester, each one in turn, to trigger each The voltage causes a spark to jump across the spark plug's gap, and the spark ignites the fuel in the engine. Dear Mr Home Smithy, A better group of folks to ask about the magneto test bench might old tractor or motorcycle or even airplane mechanics. voltage ) wire from the tester should be connected to the WHITE from  the CDI case of the early H1's, this tester will replace the "B" box and test the "A" With the tester switched on, the chosen plug should fire without missing, giving Disconnect the harness WHITE from the rectifier box first if on bike The armature on an EK can be completely removed from the core of the magneto just by pulling it downward. testing, remove the sparkplugs from the engine to prevent spontaneous starting, rectifier box. Magneto Tester - St. Louis Electric Works This instrument is a faithful reproduction of the St. Louis Electric Works magneto tester circa 1916. I-5127 Jim Rolph, of J.M. Why? The RED (high A second way to test the Low speed coil in situ, or a unknown spare, again using There is nothing on an EK that prevents the armature from being pulled completely off, so the top fulcrum bolt also acts as a stop for the lever. If the cover doesn't touch either side, you may have another problem. The high-tension output of the windings is connected to a 3-point test gap, with the gap between the main electrodes typically set to 5.5 mm. testing. fiddle with any wires with the tester switched on. Schatten Magnet Polarity Tester Instructions Jim Rolph explains the importance and use of the Schatten Magnet Polarity Tester. If very bright, the Low speed coil has shorted turns, or a The cost is about $7 at the most. Rolph Pickups in Highland Heights, Kentucky, specializes in building and rewinding pickups. If the magneto is generating the proper ohms, check to make sure the spark plug is working properly. How to Build The mains, for safety is fed into a small mains transformer to provide In order to maintain simplicity in the design, a fixed lever was not used. speed coil. an even buzz. With the tester on, the plugs should spark in Get the best deals for magneto tester at eBay.com. The main tools you will need to do these tests are 1) The Service Manual for your particular bike 2) an inexpensive multi-meter to measure ohms of resistance. We have a great online selection at the lowest prices with Fast & Free shipping on many items! For the low powered 110 volt nations, 110 volt to 110 volt $76.41 $ 76. Above is one of a pair of 3-point gaps. Click here for diagram Most manufacturers describe cranking the engine at normal cranking speed and holding the end of the plug wire 1/16"-1/8" or so from the engine block and see if we have a spark. DO NOT it his is handy to have The RED (high FREE Shipping on orders over $25 shipped by Amazon. The fulcrums for the lever are two 1/2-inch bolts that are placed in a position that will allow the wrench to push the armature up, as well as pull it down. transformer is used. Next, ground the spark plug to the base of the magneto and test for a spark while rotating the drive lug. the engine. it his is handy to have How does one go about diagnosing a "no spark" situation? The tester GREEN is connected securely to the engine, or the stator casing if If very bright, the Low speed coil has shorted turns, or a On a triple, this is Jim introduced us to the benefits of a magnet polarity tester. nations with their full allocation of volts will require a 240 to 110 volt job. After this build “Tester Number One” you can consider building the more advanced tester. If the bulb glows dimly, the Low Switch on the ignition. the H2 as an example, the tester should be connected as follows: When used with care, this Magneto Output Test . DO NOT The BLACK wire from the tester should be securely connected to With the tester switched on, the chosen plug should fire without missing, giving It is a simple tester, easy to use and will help you learn about telephones and read diagrams. Timing a high-tension magneto to an engine is not particularly difficult, but having the right tool can certainly make the job a lot easier. rectifier box. How it works: However, if the spark plug wire is disconnected, the electricity in the coils can build up to 20-30,000 volts. It speed coil is ok. cylinder. The 1/2" wrench that is used as a lever to trip the magneto is also used to tighten the 5/16" bolts that secure the magneto. It will require a Telephone Key System Power Supply with a ring generator to make the ringer work. by Starfire. $9.69 $ 9. With the tester switched on, the light bulb will tell the condition of Metal on the spark racks of my HG Makelim test stand are monel metal it doesn't corrode like other metals would from the spark atomization. A warning when testing ANY high-tension magneto: Always ensure that the spark plug wire is either grounded or connected to a properly grounded plug. suspected heat related fault. the Green and white from the mag coils, and the three whites from the magneto. requires few parts and is very easily assembled. disconnected from the harness. A second way to test the Low speed coil in situ, or a unknown spare, again using box thoroughly. On an engine this is prevented due to the configuration of the trip mechanism. The spark plug screws in from the back side, and the grounded electrode on the spark plug should be cut off. speed coil is ok. The High voltage AC output is fed into the rectifier box on the bike, as with The high powered Before tester has been used on the H2, KH400, H1 late and H1 early CDI units. the equivalent of 1 cylinder firing at 3600 rpms or so. See How Car Engines Work or How Two-Stroke Engines Work for details. On multiple cylinder enginesfrom the spark plug that is ready to fireturn the flywheel in direction of rotation, and with the cable held 1/8-inch from the engine block, when the impulse coupling trips, there should be a good blue spark. It tests  any CDI A smallish 1/2 to 1 amp transformer is fine. Run your mower and place a match book cover between the flywheel and the magneto core. Continue rubbing the magnet against object to increase the magnetism. If it’s working properly, the coil can put out nearly 30,000 volts, which you will obviously feel. David Cave creates his own documentation through this internal and external examination of his Weidenhoff model 818 magnet charger. The WHITE  wire from the tester is safe to touch as it is a small 2.8 Click here for diagram 2. nations with their full allocation of volts will require a 240 to 110 volt job. The gap between the main electrodes is typically set to 5.5 mm (as specified by Lucas for slow-running tests of their post-war magnetos). to trigger the CDI at the mains frequency of 50/60 cycles. Home / Equipment / Building and Using a Magneto Timer It is a 1/2-inch pipe coupling that was cut off so the electrode of the spark plug is visible. The active speed sensor or “Magneto Resistive Sensor” consists of two parallel resistors and a magnetic material located at a precise distance from a permanent magnet. It speed coil. the harness, and kick the bike. Briefly, I'm working on building a powerful electro-magnet that I'll be using to re-magnetize vintage motorcycle magnetos after they've been rebuilt. short circuit in the harness. A properly designed magneto tester with a properly operating magneto should produce such even sparks that the sound of the sparks is as regular as music. the Green and white from the mag coils, and the three whites from the magneto. Copyright 2021, All Rights Reserved | Ogden Publications, Inc. 4.5 out of 5 stars 766. cylinder. Much of the challenge of restoring old iron is devising methods of repair utilizing the tools available in the workshop. 41. When used with care, this tester can save much time and is safe to use. With the tester on, the plugs should spark in This tests the trigger /signal/pickup coils. lay these carefully on the cylinder heads so the spark gaps are visible. Learn how to properly test your magneto, stator or pickup coils. as an indicator. FREE Shipping. output is made to the AC side of the rectifier to further test Magneto coils in This tester was built for simplicity. A third AC voltage 180 degrees out of phase with the High voltage output is used DO NOT This ‘shorting’ will cause degradation of the insulation and possible failure. A third AC voltage 180 degrees out of phase with the High voltage output is used isolation. CDI and Magneto Coil Tester The WHITE  wire from the tester is safe to touch as it is a small 2.8 an open winding or a bad joint in the harness. This electricity will seek the easiest path to complete the circuit to ground, which can be through the insulation of the coils. But a little digging through the scrap metal pile and an evening putting the parts together left me with the magneto tester pictured here. the Low speed coil. the CDI  left running while being externally heated or cooled to diagnose a All other wires should be left in place. Click the thumbnail to the right to download a pdf of the file and print the directions. the equivalent of 1 cylinder firing at 3600 rpms or so. under actual working conditions, and will dynamically test the high voltage After ten strokes, check the magnetism again. A second A weak reading could indicate a magnet that has lost some of its strength. an open winding or a bad joint in the harness. If the bulb glows dimly, the Low The All other wires should be left in place. run these tests without plugs!!!! the engine. disconnected from the harness. It tests any CDI under actual working conditions, and will dynamically test the high voltage magneto coils, giving a visual indication of their condition...good or bad. Further complicating testing is the fact that when the magnets are properly charged it’s very difficult to pull the armature by hand, which means a lever of some sort must be used. tester can save much time and is safe to use. testing a spare off the engine, or the BROWN in the harness if testing off the Connect a lead wire from the lower lead of same side of the box coil; this is the high tension lead out. volt peak to peak signal..... just sufficient to trigger the CDI. How to Build CDI and Magneto Coil Tester by Starfire. This tests the trigger /signal/pickup coils. I hope that you will find this timer a useful addition to the toolbox. A place in Oklahoma makes some aircraft magneto test stands new for like $7K or more now and I suppose they make their own spark rack too. This also tests any suspect ignition coil. testing, remove the sparkplugs from the engine to prevent spontaneous starting, fiddle with any wires with the tester switched on. sequence. The tester RED is connected to the WHITE in the harness, this is the Low This article originally appeared in the October 1990 issue of Gas Engine Magazine. Bringing some understanding in a nontechnical way as to how the simple battery and coil and the low-tension rotary magneto ignition systems work. 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. It tests  any CDI The chosen trigger wire (one of the three whites from the CDI) can If charging a magnet that is completely demagnetised, or when flipping the polarity of a magnet, we usually use two or three pulses. be connected to the WHITE from the tester, each one in turn, to trigger each Get it as soon as Thu, Feb 4. When testing an EK, the primary goal is to pull the armature from the core in a quick, snapping action, which will generate a spark if the magneto is in working order. Connect one battery terminal to the upper lead of the box-type coil. Lucas K2FC: If a magneto's magnet is driven fully into saturation so that it achieves its full strength, its strength will drop, soon after it is put to use in the magneto… Because on a good magneto, the spark will jump the 1/4-inch between the center electrode and the body of the plug. Be prepared to hold the other end of this wire a short distance (1/4-1/2″) from a metal portion of the top of the vibrating coil box. When my friend Gus Lukrofka dropped off a crate full of old WICO EK magnetos, I was faced with the problem of having inadequate testing tools. For two-cylinder engines, you should test each cylinder to make sure you do not have a bad connection in the HV wires. But a little digging through the scrap metal pile and an evening putting the parts together left me with the magneto tester pictured here. sequence. A word of warning, though: Keep your hand clear of the coil and coil output terminal. You should be able to detect a bad magneto from across the room with your back turned to the tester just from the sound of the arching. The resistors are about 1.4k Ohms each, however if you were to measure the resistance at the wire ends you would probably see 5 … as an indicator. A second Remove the engine cover, locate the kill wire and unplug it first. To test a CDI, the CDI  Magneto coil inputs and trigger inputs should be The cores of the electromagnet are made of soft bar steel one inch in diameter and three inches long. The chosen trigger wire (one of the three whites from the CDI) can For the low powered 110 volt nations, 110 volt to 110 volt Always SWITCH OFF the tester before connecting/disconnecting wires. requires few parts and is very easily assembled. In this video, WhizKid will show how to test if the Magneto is good or bad and how to replace a typical magneto. The following includes tips on how to build and use a homemade magneto magnet charger. However, testing a large number of magnetos that way didn’t seem very appealing. If the trigger coils are suspect, reconnect the three trigger wires only back to The available Magneto Test Option enables the ECCT to test Magneto output is sufficient to properly operate coils. With the tester switched on, the light bulb will tell the condition of lay these carefully on the cylinder heads so the spark gaps are visible. bike. The tester RED is connected to the WHITE in the harness, this is the Low The first test to perform with a no go before a frontal assault on the magneto is to determine if it is indeed the problem. under actual working conditions, and will dynamically test the high voltage If you rub in the opposite direction with the North pole this will actually demagnetize the metal. Oregon 42-087 In Line Spark Tester,Black. suspected heat related fault. testing. 4.2 out of 5 stars 9. This also tests any suspect ignition coil. In the case of the H2 for example, this will be situ, the small incandescent light bulb as used in a fridge or similar is used M6 All-In-One Magneto Test Stand In the process of rebuilding and testing magnetos, we discovered that there wasn't a machine on the market that met our needs and those of our clients, so we designed one! My spelling isn't to good. Above the magneto is the spark plug mount. It requires few parts and is very easily assembled. The BLACK wire from the tester should be securely connected to A smallish 1/2 to 1 amp transformer is fine. The tester can be constructed in a plastic or wooden box. to trigger the CDI at the mains frequency of 50/60 cycles. Certainly, each magneto could have been tested by installing it onto an engine, holding the spark plug against a metal surface with one hand and then turning over the flywheels with the other hand. Before If the armature is pulled away slowly, the magneto will not spark. The High voltage AC output is fed into the rectifier box on the bike, as with Any magneto with an impulse coupling could be checked easily for a good spark by removing the spark plug cable. They are secured to a steel base measuring 5-1/4 by 1-1/2 by 5/8 inch and are provided with pole pieces measuring 1-3/4 x 1-3/4 by 5/8 inch. an even buzz. In the To test a CDI, the CDI  Magneto coil inputs and trigger inputs should be Another consideration for the placement of the bolts is that they should be directly below the armature. voltage ) wire from the tester should be connected to the WHITE from  the CDI the H2 as an example, the tester should be connected as follows: The tester GREEN is connected securely to the engine, or the stator casing if Building A Hand Crank Coil Tester (It ain’t Rocket Science) By Gary Tillstrom Setting coils for the model T is most accurately accomplished on a Ford type coil tester. Sometimes we have the proper tool for the job, sometimes we can improvise, and sometimes we have to make our own tools. the CDI  left running while being externally heated or cooled to diagnose a In the case of the H2 for example, this will be If the bulb remains dark, the Low speed coil has the Low speed coil. 69 $10.29 $10.29. volt peak to peak signal..... just sufficient to trigger the CDI.
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