Posts: 34. 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. Excellent "how-to". 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. Even if the points surfaces look good, clean them with fine emery cloth to remove any oxide layer. pages on how to do that. dynamos, regulators, alternators and When you purchase through links on our site, we may earn an affiliate commission, which supports our community. item. If you have a plug tester available that adds simulated compression pressure (using air pressure) to the end of the exposed plug while firing voltage to it you will see the more pressure the higher kv the plug needs to fire correctly. Vintage Lucas magneto, working, 4VRS CO5,good condition I'll try the 3/16" gap test. I did notice a very small spark between the contact breaker points. If you are using an auto-advance timing gear, stuff a length of fuel line in the mech to hold it at full . Click Here to view Lucas face cam (magdyno) parts manual. 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. yourselves. grade to avoid carbon deposits on the slip With BTH devices, if the moving point assembly fouls the eccentric pin, the pin will need to be adjusted. Twin sparks provide two flame fronts within the cylinder, these two flame fronts decreasing the time needed for the fuel charge to burn. At any one time, we reckon to At least I assume so: My timing light (seen in photo clamped to plug wire #1) illuminates correctly when plug #1 is unscrewed from the engine and sparks, but it does not light up when the plug is screwed into the engine. If you can't get even 1/4", I would be worried it would not work under the stress of being in the combustion chamber. If not provided with a safety gap, there is a risk of expensive damage. Remove the cam, carefully noting which way round it goes and which notches in it engage where. We shall resume operations as soon as we possibly can. However, if the outside of the pick-up is also oily, perhaps its all caused by an engine oil leak. 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. If you do not obtain readings substantially the same as the reading you obtained in the internal HT continuity section, and if everything else you previously checked is still good, it indicates that the pick-up brush(es) is/are not making good electrical contact with the brass of the slip ring. [5] The hub of the magneto rotates while the drive shaft is held stationary, and the spring tension builds up. You need to confirm that the condenser has failed AND that replacing it will solve the problem. books, learndpapers and patents on Measure the resistance between the magneto body and terminal in the plug cap. To maintain a dedicated website that covers the With the plugs in the engine connect one plug outside like you have been testing it to confirm no spark, If there is spark present I would open the gap of an old spark plug to 3/16" and see if the spark will jump that gap. MochetVelo JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571. Having removed the contact-breaker assembly from the magneto, disassemble it, noting where each part was. That then produces a gap of about 4 mm between the centre electrode and the screw-threaded bit of the plug body. 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. The plugs all light when loosened, but not when installed. use in our workshop for magneto servicing Coil may still function somewhat and not completely failed but ratio of turns lost because of insulation breakdown. This is really common on original units as the Lucas condensers were made from wax paper and foil. 0000004414 00000 n Dansk 0000003777 00000 n Voltage across the primary coil results in a proportional voltage being induced across the secondary winding of the coil. read more deeply). With twin- or multi-cylinder magnetos, and some single-cylinder magnetos, the brass is a segment, rather than a complete ring, and you may need to rotate the armature in order to be able to see it. found elsewhere on the internet or in the found in all rotating-coil magnetos. 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. The reading will probably be a fraction of an ohm. I worked on farm equipment for my last real service job from 2013 thru 2016. We also have kits for more unusual magnetos, such as the BTH, ML, Magnetos France, Morel, Lucas wader, Lucas KVF, etc., and for cars. If you do, then replace the pick-up. Your mag likely has a bad condensor. So, re-check everything in the contact-breaker assembly first before deciding on a more complete overhaul. Oil on the inside of the pick-up is usually indicative of a failure of the magnetos oil seal, in which case the magneto will need a more complete overhaul. 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. Stored in the dry. Trouble starting my 1924 Citroen engine. Put a smear of grease on the lobe(s) of the cam. If you are having trouble with your ignition system we recommend that you first change your spark plugs and HT leads. old condenser to be disconnected. Thorspark magneto ignition repair FAQ - Sussex motorcycles Contact-breaker Re-installation and Points Setting. Magnetic - Check magnetism and Remagnetise magneto body. We also provide If the coil has been in service since the magneto was new there is a good chance the insulation has started to break down, allowing voltage to track. 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. Make a note of the reading; youll need to refer to it later. things we think matter when it comes to magnetos and. A capacitor is placed across the points which absorbs the energy stored in the leakage inductance of the primary coil, and slows the rise time of the primary winding voltage to allow the points to open fully. Check the state of the contact return spring and replace if broken. replace it with an EasyCap. If it does not jump 3/16" it probably will not fire a cylinder under compression. i found that is a cheaper, easier way to go than doing it my self with refurbished parts. I pulled my B34 out after the winter and could not get it started. Language links are at the top of the page across from the title. 0000001913 00000 n Now line up your degree wheel with the pointer at 38*. Now that the slip ring has dried off, replace the pick-up(s). 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. You are probably loosing amperage through the jumper cables. If higher than that, investigate. 0000001184 00000 n 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. The wires are copper core with non resistor caps. Capacitors are replaced with ones that have a longer life expectancy and greater reliability. fitted, the EasyCap becomes a routine service Pick-up brushes of the highest quality are also available, of the correct grade to avoid carbon deposits on the slip ring. 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. slip rings and pick-ups for Lucas and BTH It should fit properly in only one precise position. Points and contacts cleaned, and wires tested for continuity. If it was a typo then you can run it with the cap and rotor off by just holding your wire to the HT terminal and that would eliminate the cap land rotor from the equation. If youre giving your magneto a thorough check over, we suggest you tackle jobs in the order shown. Others have an earth brush between the main body of the magneto and an earth track of the armature. errors in the translations. Check the state of the tappet and replace if necessary. (Japanese) Lucasworkshopinstructions-otherstuff. relating to our products, others more general 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. Deutsch We provide Upgrade your membership to The condensers we get now are made in area's that there are no or very poor quality control checks. Really need a coil tester. . 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. unfortunately the repair did not work as the Coil did not work so it had to be sent to rewinding. heavier the better. 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. magnetos available for sale or in [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. One or more times per revolution, just as the magnet pole moves away from the coil and the magnetic flux begins to decrease, a cam opens the contact breaker (called "the points" in reference to the two points of a circuit breaker) and interrupts the current. Magneto coils are usually a long time dying. This was examined earlier. books. The impulse coupling uses a spring, a hub cam with flyweights, and a shell. Blue spark is great but if it can only jump .03" when external of a cylinder with no compression pressureswhen you add the compression and fuel mix it will fall on its face. Svensk 2,330 views Oct 18, 2020 16 Dislike Share Air Fuel Mixologist 1.31K subscribers I purchased this Lister D petrol (gasoline). PA. I have seen that a lot on FM mags. Lister D Magneto Lucas RS1 full rebuild but still no spark Coil Fail. After a full rebuild my motor started right up, rode for 5 minutes, stopped, no spark. Main-body Earth Brushes and Bearing Insulators: Some magnetos have an earth brush between the contact-breaker back-plate and the contact breaker housing. Our 1. If you havent already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. We Checked it over and found no spark. the brush spring is not touching the terminal in the pick-up holder; the connection between the cable and the pick-up is corroded; the screw in the plug cap has gone down the side of the HT cable and not down its centre; Slip-ring equipment. Carefully check for any cracks or pin-holes in the pick-up. It shouldnt be very many ohms, and certainly less than 30 ohms. Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil ignition systems. that more owners can not only maintain their magnetos, After a series of checks, I sent it back to the rebuilder. 0000000783 00000 n Reassemble and check operation. Please note: THEY ARE NOT FOR SALE! March 21, 2020 in Technical. rebuilt amature runs about 85pnds from independent ignition. If not free to move, ease it. many ignition systems, focusing especially on This will not stop the coil from working. It is almost a given that a Lucas armature will require replacement if in the original condition. This video details the work done to the magneto so far. A second coil, with many more turns than the primary, is wound on the same iron core to form an electrical transformer. or 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. Rotate the armature and check that the contact- breaker spring never touches the cam. with a fixed register in the cam housing and with the advance/retard actuator). We can adapt for most applications. Replace the main-body earth brush, if applicable. LUCAS MAGNETO TROUBLESHOOTING | JRC Engineering, Inc. Thank you for your patience. Pick-up brushes of the highest detailed instructions in our 'condensectomy' The reading should be between 0.5 and 0.7 ohms greater than your first reading. After you get your spark strong enough, then worry about cap and rotor. Magneto Parts Archives - Rex's Speed Shop If the magneto wont produce a spark across a 6 mm (or 4 mm) gap at leisurely kicking speeds, and if youve satisfied yourself with all the other checks described earlier, then it probably needs a more complete overhaul. information as we can about the electrical equipment I purchased this Lister D petrol (gasoline) engine that came on a trolley with an Aerograph air compressor. Gift Article. This is really common on original units as the Lucas condensers were made from wax paper and foil. of which is the product of Brightspark Magnetos Ltd's ZK~!c. If there is a groove where a lubricating felt should be, but is missing, consider making and fitting a replacement. If the reading is less than 3000 ohms, it would be unusual, but is indicative of a problem. In the inductor magneto, the magnet is rotated and the coil remains stationary. Without suppressor: suppressor: Percentage difference with suppressor: Peak HT voltage to initiate spark: 9600 V: 10600 V at magneto: 10.4 %: 9300 V at spark gap-3.1 %: DC component of HT current immediately after striking spark: 53 mA: 52 mA-1.8 % Ignition magneto - Wikipedia DIY Magneto Maintenance and Troubleshooting You must log in or register to reply here. 0000009971 00000 n The use of ignition magnetos is now confined mainly to engines without a battery, for example in lawnmowers and chainsaws. Check the condition of the HT lead(s) and plug-cap(s) and replace where necessary. 0000002409 00000 n downloadable drawings for those of you who I got it back, spun it, sparked. Lucas KF2 magneto failure - Britbike forum Magneto: No Spark - Antique Automobile Club of America If the pick-up is retained by spring clip, swing it to one side while holding the pick-up in place. To have the discharge go arc back into the coil itself or the mag housing causes some serious damage. So I'm having an issue that is frustrating me and my mag rebuilder. What else could possibly be grounding this? I do not know it all but I will try to help. You can check for this by trying to start in a dark area with no lighting. https://www.smokstak.com/forum/attachment.php?attachmentid=294172&stc=1&d=1508717862. I forgot about this. Regrettably, some Acrobat .pdf files might not trailer Brightspark Magnetos Ltd disclaims responsibility for any errors Lucas SR2 Magneto - Hitchcocks Forum Norsk To help magneto owners look after their magnetos The last of these possible reasons is very often the cause. If there are any, repeat until the paper comes out clean. Will It Spark? and other magneto parts. Timing Lucas K2F and K2FC Magneto | Jockey Journal Forum [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]. Wrap some rag around the end of a stick about 1/4 diameter, moisten it with petrol or other cleaning fluid (but not so much that it is dripping), poke it through the pick-up hole in the magneto body, and rotate the armature to clean the slip ring. Lister D Magneto Lucas RS1 full rebuild but still no spark - YouTube 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. On the very first BSA I ever owned, I sufferred the same problem. wish to make the required puller tool part-exchange. startxref Contact Us - DO NOT EMAIL CAR QUESTIONS. and overhauls. Great write up, with video even! In the late 1890s, English engineer Frederick Richard Simms and German engineer Robert Bosch developed the first practical high-tension magneto. As the magnet moves with respect to the coil, the magnetic flux linkage of the coil changes. With your multimeter set to display resistance and connected to the opposite faces of the circuit board of the EasyCap (and with your fingers touching no more than one side of the circuit), the meter reading should climb up from a low value until it goes off the scale (OL). Put it on bike, timed, no spark. 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. Our patented EasyCap is a simple We are unfortunately not able to offer 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). After 20 miles the ignition is down to zero. 0000001015 00000 n In that case, it it best to dismantle the magneto to retrieve it. You need to be a member in order to leave a comment. By here. Nice work. commonly found on classic motorcycles. 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. For a better experience, please enable JavaScript in your browser before proceeding. From time to time we have complete In the right direction (clockwise, looking at the points) and a fairly healthy looking spark should jump the gap from one ht at a time, lead to casing. magnetos. Measure the resistance between the magneto body and terminal in one and then the other of the the plug caps. The spark is fine on this coil, keep in mind the faster you turn a mag, the better the spark. Franaise Deutsch Once detailed guide to maintaining and Hi group, It is summer in Denmark, nice but my Lucas KF2 Magneto do not like high temperatures. if it doesn't jump 3/16" double check the points to see if they are shiny clean the whole face of each point. Magnetometer for measuring magnetic flux density at the centre of the armature cavity Measurement before remagnetisation Remagnetiser . At least I assume so: My timing light (seen in photo clamped to plug wire #1) illuminates correctly when plug #1 is unscrewed from the engine and sparks, but it does not light up when the plug is screwed into the engine. ring. Place a clean piece of strong paper between the points, and with the points closed pull the paper out. 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. The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. Nederlandse Do not skimp on quality with pick-up brushes. When screwed in the head, however, the plugs make no spark. Lucas vertical magneto in good condition and sparking. Lucas Magneto Bearing Shim Pack 15mm | E15 | N3048 | K1F | SR | K2F . With the engine running, place your hand over the pick-up with the same hand also touching the magneto body. %PDF-1.5 % Put a smear of grease on the tappet shaft. Great photos, quality! Thanks again. All 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. If you need more information, or wish to order by post or pay over the phone, please ring: 01273 913181. Also, many magnetos (especially twin- and multi-cylinder devices) are provided internally with safety gaps, typically of 6.5 to 7.5 mm, and if the magneto cant find an outlet through whatever is or isnt connected to it, it happily sparks the safety gaps instead. and just how were you able to find one of those bastards that still worked?!?!?! Lucas Ga4 Magneto Austin 7, Morris, Riley And Many Others Service Exchan. Brightspark Magnetos Ltd disclaims responsibility for any Over time the HT leads can degrade and reduce the potential difference at the spark plug. This expediential degradation may appear to be sudden when the fault occurs. For example: Check as best you can that the brush is actually making contact with the track on which it runs.

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