Rotate the armature until the contact-breaker points are open. As the magnet moves with respect to the coil, the magnetic flux linkage of the coil changes. Ignition magneto - Wikipedia dynamos, regulators, alternators and i have had 3 done here by ed strain that included rebuild with remagnatized body for a little more than $200.00. 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. Voltage across the primary coil results in a proportional voltage being induced across the secondary winding of the coil. in the translations. Check that all the insulators are in good shape, and reassemble the contact breaker assembly. With the points fully open, adjust the points gap to 0.012 (0.3 mm). When you purchase through links on our site, we may earn an affiliate commission, which supports our community. PDF LUCAS MAGNETOS - edknet.de and just how were you able to find one of those bastards that still worked?!?!?! Language links are at the top of the page across from the title. The Magneto Guys - Vintage, Veteran, Classic Magneto Repairs Lucas Magnetos We have overhauled and repaired these Lucas magnetos and then returned them to their owners. load correctly in the translated versions of the pages. To all you guys with Lucas magnetos with problems, get ready to see it fully functional for about $23 shipped, along with a little work in your garage. Points and contacts cleaned, and wires tested for continuity. I would definitely try another condenser if it were me. 82 0 obj<> endobj If necessary, dress the points on a fine stone. Thanks again. with a fixed register in the cam housing and with the advance/retard actuator). Photo-sequences of stripping and themselves. If your magneto is loosing spark after a short amount of time running, or is hard to start it is most likely a condenser failure. If you can see the slip-ring through the pick-up hole in the main housing, check that the brass ring or segment of the slip-ring is brass coloured (albeit possibly a bit dirty or tarnished), but not completely black. With the earth brush(es) now replaced, measure the resistance between the back-plate of the contact breaker assembly and the main body of the magneto. BTH mags utilized condensers made from mica. 0000001184 00000 n Common Faults on Magnetos Even if the points surfaces look good, clean them with fine emery cloth to remove any oxide layer. While holding it in that position, tighten the centre screw, but do not use undue force. Tri-Spark Ignitions; Pazon Ignitions; Lucas Rita; AGM Batteries For Classics; Lucas Alternators; Rectifiers & Voltage Control; Dynamo Parts; Magneto Parts; Lucas SR Magneto Spares; HT Coils For Classic Bikes; British Bike Points & Condensers; . Place a clean piece of strong paper between the points, and with the points closed pull the paper out. degrade with age. Brightspark Magnetos - Home Replace the main-body earth brush, if applicable. The high voltage will simply arc across the gap. ring. All rewound units now have modern condensers and enameled wire. On many Rolls Royce models there is a dual ignition system. Don't flame, hate, spam. In that case, it it best to dismantle the magneto to retrieve it. Posts: 34. 0000001015 00000 n Trademark Office. . Remove two nuts and funny-looking-long-thing that attaches the mag to the engine Check the plug-wires at the end that goes into the mag .and remove sparkplug-cap and make sure you have a good connection (maybe you'll want to cut of a bit and re-atttach) Remove the two high-tension pick-ups from the mag Initially this was done because it was easier to provide good insulation for the secondary winding of an external coil than it was in a coil buried in the construction of the magneto (early magnetos had the coil assembly externally to the rotating parts to make them easier to insulateat the expense of efficiency). When inserting the brushes; you may have to do. This expediential degradation may appear to be sudden when the fault occurs. Powered by Invision Community. When the magneto is supposed to fire, the flyweights are released by the action of the body contacting the trigger ramp. magnetos and capacitors (for those who wish to Electrics & Ignition | SRM Classic Bikes 0000003777 00000 n demand to 'perfectly functional' or 'as-new' The irony here is that usually these magnetos fail to spark. 85 0 obj<>stream Turn the armature in its proper direction of rotation until the contact-breaker points are just starting to open on one of the cam lobes. In a modern installation, the magneto only has a single low tension winding which is connected to an external ignition coil which not only has a low tension winding, but also a secondary winding of many thousands of turns to deliver the high voltage required for the spark plug(s). 0000000783 00000 n only for magnetos, but also classic motorcycle Click on a button to see magnetos from other manufacturers Bosch BTH Others Click on any picture to get a larger view Lister D Magneto Lucas RS1 full rebuild but still no spark Coil Fail. If not provided with a safety gap, there is a risk of expensive damage. Therefore, taking the sparking plug(s) out of the engine, laying them on the cylinder head and checking whether the magneto will produce a spark at kickstart speeds is not a sufficient test. Lucas workshop instructions - magnetos This was diagnosed as the cam ring not being properly timed to the magnetic poles. %%EOF Still here since 1996 serving BritBike enthusiasts. Do similar tests with the HT lead(s) and the plug-cap(s). With an open circuit the device has no CAPACITY to absorb the reaction voltage (back EMF) from the coil, therefore this energy is dissipated across the timing contact which quickly burns away. The ratio of turns in the secondary winding to the number of turns in the primary winding, is called the turns ratio. Check that the felt pad in the end of the screw holding together the two blocks of the points assembly is present and good, and soak it in oil. Lucasworkshopinstructions-otherstuff. Due to the inevitable losses in the system, this oscillation decays fairly rapidly. JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571. Since the beginning of World War I in 1914, magneto-equipped aircraft engines have typically been dual-plugged, whereby each cylinder has two spark plugs, with each plug having a separate magneto system. ZK~!c. Any high tension magneto will have way more than 7 ohms resistance on the secondary circuit. If sloppy, consider fitting a new moving point (Lucas), bush (BTH), or pivot post. Twirl the armature. 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. found in all rotating-coil magnetos. equipment. I also want to wire up the battery better, as I'm just using jumper cables. For a better experience, please enable JavaScript in your browser before proceeding. If it is several thousand ohms, it indicates that the HT lead is resistive and/or the plug cap is fitted with a suppressor resistor. Capacitors are replaced with ones that have a longer life expectancy and greater reliability. Can you rig up real cables? Another cause of atom disorientation is mechanical shock, hammer blows or dropping the unit onto a hard surface, etc. If your magneto is loosing spark after a short amount of time running, or is hard to start it is most likely a condenser failure. 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. If there is a main-body earth brush and it is accessible, remove it and check that the spring is good, that the brush is free to move in the holder and that the brush is not unduly worn in length or diameter. When we undertake the renovation of these magnetos, we examine the following:-. Contact Us - DO NOT EMAIL CAR QUESTIONS. Check for wear and replace any worn parts. I was hoping that some of the experts might help me with a magneto problem. To contact injunmort simply click on his name and the forum will display his e-mail address, Helge. Built into the case of the magneto are magnets, permanent magnets. Always good to learn how to check lucas parts, one of the weaker parts of a triumph motor.. Classic Cycles inc. 2199 N. Batavia Suite J. By That then produces a gap of about 4 mm between the centre electrode and the screw-threaded bit of the plug body. MochetVelo Nearly all magnetos have a gasket between the pick-up and the magneto body (a) to prevent water entry and (b) to set the correct clearance between the pick-up holder and the slip ring. commonly found on classic motorcycles. This can mask a fault on these cars as the vehicle will continue to run until the other fails. (Chinese) We always replace the capacitor during a repair as experience has show us that the capacitor tends to be the most unreliable part. Svensk I do not know it all but I will try to help. 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). Check the cam surface. Links to other service providers can be found I pulled my B34 out after the winter and could not get it started. not load correctly in the translated versions of the pages. fitted, the EasyCap becomes a routine service If nobody is available, then you can make a test plug by removing the earth electrode from an old, but functional, sparking plug. U.S. agrees to $5 million settlement over police killing of Bijan Magneto Parts Archives - Rex's Speed Shop Two beveled teeth on drive gear(which are generally parallel to flat for shaft it fits on) should go to mark on rotor which is under lead out finger. detailed guide to maintaining and Some original units are still in service today. Recommendations for Lucas K2FC magneto rebuild? - Britbike forum Put a smear of grease on the tappet shaft. A fair amount maintenance and troubleshooting of a magneto can be done with the magneto in situ and without any special tools or equipment other than a multimeter. The reading should be substantially the same as the reading you obtained in the internal HT continuity section. For a better experience, please enable JavaScript in your browser before proceeding. LUCAS MAGNETO TROUBLESHOOTING | JRC Engineering, Inc. [2] An ignition magneto also includes an electrical transformer,[2] which converts the electricity to a higher voltage (with the trade-off being a corresponding reduction in the output current).[2]. If your multimeter can measure capacitance, the reading should be within 10% of: 150 nF (0.15 uF) for the C01, C02, C03, C05 and CU/150 EasyCaps; 220 nF (0.22 uF) for the C06, C07 and CU/220 EasyCaps. However, if the outside of the pick-up is also oily, perhaps its all caused by an engine oil leak. NEW AJS and Matchless Owners Club Limited | Print Article - Jampot If it is significantly higher, there is a bad connection or break in the low-tension circuit, in which case the magneto will need a more complete overhaul. %PDF-1.5 % The magneto is rebuilt by a reputable US shop. Links to some interesting It's a 6v system, so the starter turns rather slowly (maybe 80rpm), but I think it should be fast enoughto start. On more advanced magnetos the cam ring can be rotated by an external linkage to alter the ignition timing. Espaol I wonder if hand-cranking might get it going. Others have an earth brush between the main body of the magneto and an earth track of the armature. What else could possibly be grounding this? "Colonel fair is fair: if I nail Hotlips and punch Hawkeye can I go home too?". Alnico, the material most often used to fabricate early magnets has a tendency to lose its induced magnetic field over time due to various causes. Thank you for your patience. The engine needed some attention, which it has now received, but I had to take the magneto off. Not quite as large as ideal, but simple. Don't want this buried as I 'm hoping for some possible answers today. I have seen that a lot on FM mags. This video details the work done to the magneto so far. Ensure that you have the proper gasket fitted. I think it may be do to condensor failure. As the size of the combustion chamber determines the time to burn the fuel charge, dual ignition was especially important for the large-bore aircraft engines around World War II where it was necessary to combust the entire fuel mixture in a shorter time than a single plug could provide, in order to build peak cylinder pressure at the rpm desired. Franaise If possible, get somebody to help. Put a smear of grease on the surface of the cam that engages its housing. 0000009971 00000 n read more deeply). If there is a difference, adjust the points so that it is the smaller gap that is 0.012 (0.3 mm). instructions). Check that the spring of the pick-up brush is good, that the brush is free to move in its holder and that it is not unduly worn in length or diameter. Open the points and blow between them to dislodge any remnants of paper. Deutsch https://www.smokstak.com/forum/attachment.php?attachmentid=294172&stc=1&d=1508717862. wish to make the required puller tool Downloadable drawings, all for free, for [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. or A short circuit absorbs all the power, hence no output or spark. The older term "high-tension" means "high-voltage".[1]. classic owners. Translations provided by the Google Translate service. Lucas Magneto Bearing Shim Pack 15mm | E15 | N3048 | K1F | SR | K2F . The other plug cap should give a reading that is infinite (OL) or extremely high. troubleshooting your magneto. slip rings and pick-ups for Lucas and BTH VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. A second coil, with many more turns than the primary, is wound on the same iron core to form an electrical transformer. 2,330 views Oct 18, 2020 16 Dislike Share Air Fuel Mixologist 1.31K subscribers I purchased this Lister D petrol (gasoline). capacitance to satisfactory ignition system Thoroughly clean the pick-up using a rag moistened with petrol. or. If you are having trouble with your ignition system we recommend that you first change your spark plugs and HT leads. Nous replace it with an EasyCap. but enjoy doing it, with confidence, relying on the If you need more information, or wish to order by post or pay over the phone, please ring: 01273 913181. if it doesn't jump 3/16" double check the points to see if they are shiny clean the whole face of each point. Rotate the armature and check that the contact-breaker assembly does not foul its housing. Because it requires no battery or other source of electrical energy, the magneto is a compact and reliable self-contained ignition system, which is why it remains in use in many general aviation applications. LUCAS K1F MAGNETO RUNNING AT 1200 RPM AT THE ARMATURE. These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. The permanent magnet can be static, as in the classical horse-shoe form, with the transformer windings rotating between the poles, or sometimes the magnet is mounted on the armature and rotates within the core of a static winding. Having set the timing with the points opening on one cam lobe, you should check that it is also correct with the points opening on the other cam lobe. Hi group, It is summer in Denmark, nice but my Lucas KF2 Magneto do not like high temperatures. Come join the discussion about performance, restorations, modifications, classifieds, troubleshooting, maintenance, and more! 0000006861 00000 n We shall resume operations as soon as we possibly can. DO NOT ATTEMPT THIS IF YOU ARE FITTED WITH A PACEMAKER, OR HAVE A HEART CONDITION, OR IF YOU REALLY HATE ELECTRIC SHOCKS. All I would be interested to hear from people who either have seen this running or know of similar setups in forges. 0000005952 00000 n of which is the product of Brightspark Magnetos Ltd's With Lucas devices, if it fouls the contact-breaker spring, the contact-breaker assembly will need to be removed and the effective length of the spring increased as necessary. You are probably loosing amperage through the jumper cables. DIY Magneto Maintenance and Troubleshooting heavier the better. With the Lucas KN1, it is under the identification tag. here. A really nice one will jump 1/2"or better. On the very first BSA I ever owned, I sufferred the same problem. In either case, the magneto needs a more complete overhaul. If it is significantly lower, then there is probably a short-circuit in the contact-breaker assembly or in the armature. 096792012013 - 2020 | Website design by The Net Effect of Sheffield, Website design by The Net Effect of Sheffield. Check the state of the heel of the moving-point assembly. The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. If an earth brush is fitted behind the back-plate, check that the spring is good, that the brush is free to move and that it is not unduly worn in length or diameter. 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.) Mechanical - Bearings, insulation, washers and shimming the armature. Copyright 2023, Antique Automobile Club of America. Joined: Oct 2009. March 21, 2020 in Technical. -- Tickover, pulling away, and low-speed running erratic. Checked it over and found no spark. Magneto: No Spark - Antique Automobile Club of America I would narrow the plug gaps to .020" and see what happens. Magnetic - Check magnetism and Remagnetise magneto body. [7] Ignition magnetos were largely replaced by ignition coils once batteries became common in cars, since a battery-operated coil can provide a high-voltage spark even at low speeds, making starting easier.[8]. 0000003162 00000 n Also, some pattern contact-breaker assemblies are too large at the fat end and need to be filed or ground to size. 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. Put it on bike, timed, no spark. anglais, votre convenance. If your bike runs poorly, backfires at all but idle, stalls out and won't start back when hot, then works again when cool. The coils are, of course, designed for this pressure but no insulation is perfect. A lot of carbon dust on the inside of the pick-up indicates that the brush is too soft, in which case it should be replaced with a brush of the correct grade. No this is the type of stuff I like logging in to see! I can never stress this enough to people who try to test out their mags. This will not stop the coil from working. relating to our products, others more general They were used in the village forge in Cullworth (northaptonshire). You can check the latter by removing the pick-up(s), rotating the armature in the proper direction until the points are just opening, and checking that the brass is visible directly underneath the pick-up hole (or one of the pick-up holes) in the magneto body. These are prone to deterioration and the cause of many ignition faults. 82 23 Because the magneto has low voltage output at low speed, starting an engine is more difficult. i'm an asshole, you probably shouldn't listen to me. Stored in the dry. However, if the reading is more than 7000 ohms, there is probably either a break in the HT winding, or a bad connection between the live end of the HT winding and the slip-ring. Measure the resistance between the magneto body and terminal in one and then the other of the the plug caps. However, dont make them lop-sided. We shall resume operations as soon as we possibly can. Also, with the points open, check that there is an open circuit between them; if fitted with a Brightspark EasyCap, it will take a little while for the resistance reading to climb off the scale. Lucas (and most other) capacitors made in the 50's & 60's used a paper dielectric. Turn the armature in its proper direction of rotation until the contact-breaker points are just starting to open on the other cam lobe. Click Here to view Lucas face cam (magdyno) parts manual. Parts lists and workshop instructions, not Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil ignition systems. JavaScript is disabled. Our preferred gap for spark testing in fresh air is 6 mm. 0000004414 00000 n SR1, SR2 & SR4 magnetos (workshop instructions) and overhauls. A short circuit absorbs all the power, hence no output or spark. We will check all the parts of the magneto for faults and will provide a firm quotation for a repair along with a description of the magneto repair required. If excessively worn, replace the heel (BTH), or the moving-point assembly (Lucas). Turn the armature in its proper direction of rotation until the contact-breaker points are just starting to open. The likely culprits are: Set the timing of the ignition in accordance with the machines handbook. Will It Spark? I'll try the 3/16" gap test. If I was working on it, first I would want a 5/16" air gap consistent spark minimum from the coil terminal to ground. Make sure they are there and can move in their holders and give them a good clean. (Japanese) I tested the HT wire and spark plug and both are fine. At any one time, we reckon to Translate service. many ignition systems, focusing especially on Vintage Lucas magneto, working, 4VRS CO5,good condition If the brush is missing or there is only a very short piece in the pick-up, the brush (or part of it) may have come out and dropped to the bottom of the magneto housing. I forgot about this. BTH mags utilized condensers made from mica. If the brass is black, it indicates that the brush(es) are too soft and/or years of neglect. Ignition - Check Spark strength, Spark timing and . As the points begin to open, point spacing is initially such that the voltage across the primary coil would arc across the points. Another problem, due to constant hot, cold, expansion, contraction, vibration or mechanical impact, is breakage of the fine winding wire. He got it and thought the ring the points rides in came out and just needed pushed in.
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