the brass is in the wrong place, as a result of a magneto with a segment-type slip-ring having an incorrect cam fitted or having the wrong direction of slip-ring fitted. replace it with an EasyCap. further selection that can be reconditioned on In the Lucas MO1, it is on one side, adjacent the contact-breaker housing. Thank you for your patience. You need to confirm that the condenser has failed AND that replacing it will solve the problem. Over time the HT leads can degrade and reduce the potential difference at the spark plug. If it does not jump 3/16" it probably will not fire a cylinder under compression. After 20 miles the ignition is down to zero. After you get your spark strong enough, then worry about cap and rotor. If there is a difference, adjust the points so that it is the smaller gap that is 0.012 (0.3 mm). Remagnetisation - Brightspark Magnetos Thank you for your patience. So I'm having an issue that is frustrating me and my mag rebuilder. Lucasworkshopinstructions-otherstuff. After a full rebuild my motor started right up, rode for 5 minutes, stopped, no spark. If necessary, dress the points on a fine stone. In the case of a main-body earth brush, try moistening a cotton bud with petrol, and poke it through the hole for the earth brush to clean the track while rotating the armature, but IMPORTANTLY before doing that temporarily remove or disable the contact breaker to reduce the risk of electric shock and fire. On more advanced magnetos the cam ring can be rotated by an external linkage to alter the ignition timing. books, learndpapers and patents on The engine needed some attention, which it has now received, but I had to take the magneto off. Replace the cam, ensuring that the notches in it engage as before (e.g. The timing marks should not wander with the RPM of the drill. DIY Magneto Maintenance and Troubleshooting old condenser to be disconnected. NEWS FLASH - March 2020 As you will understand, with the Covid-19 pandemic shutting down most normal business, we are not able to despatch orders for the time being. Measure the resistance between the magneto body and terminal in the plug cap. However, for magnetos without a safety gap, if the armature is spun with nothing, or with a large gap, connected to the pick-up, it may cause a breakdown of the insulation around the HT winding or of the slip ring. I also needed a new coil for it which I installed, cleaned the mag up and replaced any bits it needed. Norsk Copyright 2023, Antique Automobile Club of America. One of the plug caps should give a reading which is substantially the same as the reading you obtained in the internal HT continuity section. Espaol "Specializing in Triumph and other fine Vintage motorcycles". I would also welcome information on some of the things shown in the video such as the handles on the trolley. A forum community dedicated to Jockey motorcycle owners and enthusiasts. detailed support we offer. demand to 'perfectly functional' or 'as-new' Dual plugs provide both redundancy should a magneto fail, and better engine performance (through enhanced combustion). heavier the better. If you have a Megger or similar insulation tester, set it to test at 500V. 2. In the late 1890s, English engineer Frederick Richard Simms and German engineer Robert Bosch developed the first practical high-tension magneto. The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. 0000002847 00000 n Grease. load correctly in the translated versions of the pages. BTH mags utilized condensers made from mica. The older term "high-tension" means "high-voltage".[1]. After a series of checks, I sent it back to the rebuilder. Now that the slip ring has dried off, replace the pick-up(s). Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil ignition systems. [5] The hub of the magneto rotates while the drive shaft is held stationary, and the spring tension builds up. With other models, it may be inaccessible while the magneto is in situ, for example underneath. Joined: Oct 2009. Put it on bike, timed, no spark. information as we can about the electrical equipment B Magneto Help - No Spark - Britbike forum 096792012013 - 2020 | Website design by The Net Effect of Sheffield, Website design by The Net Effect of Sheffield. Please note: THEY ARE NOT FOR SALE! Contact-breaker Re-installation and Points Setting. These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. I highly doubt it is excessive unless someone has been grinding the rotor or the cap. 1. If there are any, replace the pick-up. Clean and grease the moving-point pivot. I got it back, spun it, sparked. Problems rooted in the magneto are sometimes obvious, or can seem like all sorts of other things. . Common Faults on Magnetos We also have kits for more unusual magnetos, such as the BTH, ML, Magnetos France, Morel, Lucas wader, Lucas KVF, etc., and for cars. I'd need to install it in the chassis or rig up something to do that. Under construction, so far showing video When screwed in the head, however, the plugs make no spark. Norsk 5.5 mm (220 thou) THREE-POINT SPARK GAP. AJS and Matchless Owners Club Limited | Print Article - Jampot The use of ignition magnetos is now confined mainly to engines without a battery, for example in lawnmowers and chainsaws. Now let the slip ring dry out with the pick-ups still removed. A small number of electrons is ever present and over years or decades this flow carves out an ever widening pathway through the insulation. Really need a coil tester. Take a look at some of the equipment we Lucas magneto problems? NEW CHEAP solution to bad condensor We also provide Carefully check for any cracks or pin-holes in the pick-up. troubleshooting your magneto. LUCAS Magneto check "How To" - Jockey Journal Forum rebuilt amature runs about 85pnds from independent ignition. 0000000783 00000 n Lucas workshop instructions - magnetos Library Robert Bosch Documentation American Bosch workshop instructions Patents Books and learnd papers Workshop instructions - Lucas magnetos N1, KN1, K1F, K2F, KVF MO1L, MN2L Redesigned contact breaker for ring cam models SR magnetos (general info.) slip rings and pick-ups for Lucas and BTH 82 0 obj<> endobj With some magnetos, the main-body earth brush is accessible with the magneto in situ. It shouldnt be very many ohms, and certainly less than 30 ohms. i found that is a cheaper, easier way to go than doing it my self with refurbished parts. Likes: 260. scotland. Thanks. It uses a magneto and a transformer to make pulses of high voltage for the spark plugs.The older term "high-tension" means "high-voltage".Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil . The Magneto Guys - Vintage, Veteran, Classic Magneto Repairs in the translations. This dissipates the energy that was stored in the condenser in time for the next closure of the points, leaving the condenser discharged and ready to repeat the cycle. You need to be a member in order to leave a comment. In that case, it it best to dismantle the magneto to retrieve it. This induces an EMF in the coil, which in turn causes a current to flow. For example: Check as best you can that the brush is actually making contact with the track on which it runs. found in all rotating-coil magnetos. It uses a Bosch ZA4 magneto (rebuilt about 10 years back) which produces a nice blue spark in the plugs when they are out of the engine. BTH mags utilized condensers made from mica. What else could possibly be grounding this? I'll try the 3/16" gap test. For a better experience, please enable JavaScript in your browser before proceeding. LUCAS MAGNETO TROUBLESHOOTING | JRC Engineering, Inc. I wonder if hand-cranking might get it going. Not sure what came off, but 1930s/40s I would have thought.prefer collection, but would post. By Recommendations for Lucas K2FC magneto rebuild? - Britbike forum Timing Lucas K2F and K2FC Magneto | Jockey Journal Forum With the mag on the engine, there is a spark at all 4 plugs . use in our workshop for magneto servicing detailed instructions in our 'condensectomy' Magneto parts We also sell our Brightspark range of specially-selected, top-quality, British-made slip rings and pick-ups for Lucas and BTH magnetos. If higher than that, investigate. magnetos. I'm working on a Lucas Mag right now for the first time and this is extremely helpful. With the contact-breaker assembly still removed from the magneto, and with a multimeter set to measure resistance, check that with the points closed there is a short circuit between them (as close to 0 as your multimeter goes). IMPORTANT. [5] Therefore, some magnetos have an impulse coupling, a springlike mechanical linkage between the engine and magneto drive shaft which "winds up" and "lets go" at the proper moment for spinning the magneto shaft. (Japanese) From the basic to the complex - some Click Here to view Lucas face cam (magdyno) parts manual. <]>> Or what else could be causing this? Check the state of the points surfaces. With Lucas devices, the fixing hole at one end of the contact-breaker spring is slotted so that the effective length of the spring can be adjusted as necessary. An importance cause of field strength reduction is the removal of the magnet from its normal situation without fitting a keeper, a device designed to maintain the integrity of the magnetic circuit. (Chinese) Due to the inevitable losses in the system, this oscillation decays fairly rapidly. The readings for the two plug caps should now be swapped around. It should fit properly in only one precise position. As the points begin to open, point spacing is initially such that the voltage across the primary coil would arc across the points. In more modern times, insulation materials have improved to the point where constructing self-contained magnetos is relatively easy, but energy transfer systems are still used where the ultimate in reliability is required such as in aviation engines. When we undertake the renovation of these magnetos, we examine the following:-. If it is an original capacitor then it will almost certainly fail because of its age and the materials and techniques that were used to construct them.
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