I have seen that a lot on FM mags. -- misfiring, particularly at higher revs and fully open throttle, or when opening the throttle. grade to avoid carbon deposits on the slip 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. is it rebuilt? Armoto LtdRegistered & Trading Address:Unit 26, M1 Commerce Park, Markham Lane, Duckmanton, Chesterfield S44 5HSTelephone: 01246 826667 | sales@armoto.co.ukRegistered in England Company No. If there is a quickly-detachable connection between the HT lead and pick-up, undo it and check the condition of the connection. Great post! Magnetic - Check magnetism and Remagnetise magneto body. The magneto gives a good spark when spun by hand or when kicked over with the plugs removed. It should fit properly in only one precise position. First test is to take the plug caps off the HT leads and position the ends of the HT leads 1/4" away from the casting. Lucas SR2 Magneto - Hitchcocks Forum This could be because: the brush isnt projecting far enough to touch the slip ring, so check that as best you can. Lucasworkshopinstructions-magnetosLucasworkshopinstructions-otherstuffLucaspartslistsLucasATDspecificationsBTHinstructions&partslistsM-LBookletsMagntoFrancedocumentationRobertBoschDocumentationAmericanBoschworkshopinstructionsPatentsBooksandlearndpapers, Redesigned contact breaker for ring cam models, SR1, SR2 & SR4 magnetos (workshop 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. If you need more information, or wish to order by post or pay over the phone, please ring: 01273 913181. Once If it has any unusual marks, try to work out what caused them and whether anything should/could be done about them. [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. On the very first BSA I ever owned, I sufferred the same problem. Check that all the insulators are in good shape, and reassemble the contact breaker assembly. We also provide 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. (Chinese) U.S. agrees to $5 million settlement over police killing of Bijan With some magnetos, the main-body earth brush is accessible with the magneto in situ. themselves. If the timing is not correct on both lobes, the reason could be that: the contact-breaker assembly is wobbly on the end of the armature; the cam or its housing were incorrectly machined (rare); with ring-cam magnetos, the armature and cam are not coaxial due to the outer race of the bearing at the contact-breaker end not being seated properly by its insulator in the cam housing. 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. 0000003086 00000 n Then wash the points with petrol and dry them. To maintain a dedicated website that covers the magnetos and capacitors (for those who wish to 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. 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. Put a smear of grease on the surface of the cam that engages its housing. 5.5 mm (220 thou) THREE-POINT SPARK GAP. [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. We recommend using non-resistive (copper) cable and unsuppressed plug caps. Hi group, It is summer in Denmark, nice but my Lucas KF2 Magneto do not like high temperatures. In the type known as a shuttle magneto, the engine rotates a coil of wire between the poles of a magnet. If I was working on it, first I would want a 5/16" air gap consistent spark minimum from the coil terminal to ground. Lucas (and most other) capacitors made in the 50's & 60's used a paper dielectric. read more deeply). Svensk Not sure what came off, but 1930s/40s I would have thought.prefer collection, but would post. JavaScript is disabled. I'd need to install it in the chassis or rig up something to do that. If there is a difference, adjust the points so that it is the smaller gap that is 0.012 (0.3 mm). After you get your spark strong enough, then worry about cap and rotor. If you have a Megger or similar insulation tester, set it to test at 500V. We also have kits for more unusual magnetos, such as the BTH, ML, Magnetos France, Morel, Lucas wader, Lucas KVF, etc., and for cars. Nederlandse Remagnetisation - Brightspark Magnetos making your own bearing and slip-ring pullers; Brightspark Magnetos Ltd disclaims responsibility for any If there are any, repeat until the paper comes out clean. Under construction, so far showing video anglais, votre convenance. V-TWINS Magnetos are always a compromise, usually producing a strong spark to one cylinder and a weaker one to the other. I also want to wire up the battery better, as I'm just using jumper cables. Open the points and blow between them to dislodge any remnants of paper. i'm an asshole, you probably shouldn't listen to me. demand to 'perfectly functional' or 'as-new' Replace the main-body earth brush, if applicable. Electrics & Ignition | SRM Classic Bikes This disables the magneto to reduce the risk of electric shock and fire. [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]. . Italiana wish to 'demystify and simplify' wherever we can, so Post in the forum instead. With the mag on the engine, there is a spark at all 4 plugs . The resistance between the two sides of the circuit board (with your fingers well clear) should climb to in excess of 2 G (2000 M). I highly doubt it is excessive unless someone has been grinding the rotor or the cap. (Chinese) Another problem, due to constant hot, cold, expansion, contraction, vibration or mechanical impact, is breakage of the fine winding wire. Parts lists and workshop instructions, not Any suggestions? On the Lucas magnetos, the spec is to jump a .200 gap at 200 rpm for the slow speed test. here. i found that is a cheaper, easier way to go than doing it my self with refurbished parts. 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. There has been requests lately on the board for more tech stuff. When inserting the brushes; you may have to do. It's a 6v system, so the starter turns rather slowly (maybe 80rpm), but I think it should be fast enoughto start. information aggregated from many sources. It appears that magnetio does not have in impulse coupling which means the engine must turn over much faster to develop as hot a spark as if there was an impulse. In that case, it it best to dismantle the magneto to retrieve it. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Built into the case of the magneto are magnets, permanent magnets. 1. The plugs all light when loosened, but not when installed. Housings can sometimes get misshapen, in which case try to rectify that. I was bench testing by tuning the mag slowly by hand, without the impulse coupling attached, so 1/4" is a good distance. Regrettably, some Acrobat .pdf files might For example, in the Lucas K1F and K2F, the earth brush is located on top inboard of the main mounting flange. To help magneto owners look after their magnetos Check the condition of the HT lead(s) and plug-cap(s) and replace where necessary. Recommendations for Lucas K2FC magneto rebuild? - Britbike forum Can you rig up real cables? I'll try the 3/16" gap test. patterns for shims, gaskets and bearing 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. Still here since 1996 serving BritBike enthusiasts. In the Lucas MO1, it is on one side, adjacent the contact-breaker housing. Such a system is known as an "energy transfer" ignition system. He got it and thought the ring the points rides in came out and just needed pushed in. Now line up your degree wheel with the pointer at 38*. With other models, it may be inaccessible while the magneto is in situ, for example underneath. The Fora platform includes forum software by XenForo. Check the state of the contact return spring and replace if broken. This is really common on original units as the Lucas condensers were made from wax paper and foil. 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. If your magneto does not have an EasyCap but it fitted with a condenser buried in the armature, then it is impossible to check the condition of the condenser, while the armature is assembled, without specialised equipment. https://www.smokstak.com/forum/attachment.php?attachmentid=294172&stc=1&d=1508717862. If everything were perfect and clean, the resistance should be infinite (OL). Magneto coils are usually a long time dying. 82 0 obj<> endobj You need to be a member in order to leave a comment. We shall resume operations as soon as we possibly can. I'm working on a Lucas Mag right now for the first time and this is extremely helpful. -- Tickover, pulling away, and low-speed running erratic. This Lucas KVF magneto was rebuilt 7,000 miles ago and failed at around 3,000 miles with loss of spark on one cylinder. It is almost a given that a Lucas armature will require replacement if in the original condition. 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. After a full rebuild my motor started right up, rode for 5 minutes, stopped, no spark. I would also welcome information on some of the things shown in the video such as the handles on the trolley. unfortunately the repair did not work as the Coil did not work so it had to be sent to rewinding. What else could possibly be grounding this? at some of the equipment we use in our workshop for magneto servicing 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. We are unfortunately not able to offer LUCAS K1F MAGNETO RUNNING AT 1200 RPM AT THE ARMATURE. Wico-XH Magneto Won't Spark | Smokstak Antique Engine Community I was hoping that some of the experts might help me with a magneto problem. The reading should be between 0.5 and 0.7 ohms greater than your first reading. Pick-up brushes of the highest quality are also available, of the correct grade to avoid carbon deposits on the slip ring. The result in high resistance will reduce the current flow in the primary winding and reduce the magnetic flux which adversely effects the secondary winding output voltage. Initial installation does require the The place to buy our EasyCap condensers Problems rooted in the magneto are sometimes obvious, or can seem like all sorts of other things. When the magneto is supposed to fire, the flyweights are released by the action of the body contacting the trigger ramp. Lucas Magneto 1930 - 1940. 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. detailed instructions in our 'condensectomy' If you havent already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. Ignition - Check Spark strength, Spark timing and . 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. Or what else could be causing this? On more advanced magnetos the cam ring can be rotated by an external linkage to alter the ignition timing. DO NOT ATTEMPT THIS IF YOU ARE FITTED WITH A PACEMAKER, OR HAVE A HEART CONDITION, OR IF YOU REALLY HATE ELECTRIC SHOCKS. MAGNETO MAGIC - PressReader On many Rolls Royce models there is a dual ignition system. found in all rotating-coil magnetos. Measure the resistance with the two probes of your multi-meter shorted together. Brightspark Magnetos - Home Fit the magneto gear to the magneto shaft and finger tighten the nut ONLY until the gear is snug on the tapered shaft. LUCAS Magneto check "How To" - Jockey Journal Forum quality are also available, of the correct Just to reinforce a point here of something very well done that you did in the how-to: when you're testing a mag like this, ALWAYS have the plug wires hooked up with a gap (or plugs) to ground so that energy has somewhere to go. errors in the translations. if it doesn't jump 3/16" double check the points to see if they are shiny clean the whole face of each point. We would recommend having the transformer coil rewound as modern class F or H wires and insulations are superior to the ones used at the time it was originally made and would almost certainly give you another 40 years of good service. and other magneto parts. have a small choice of reconditioned The gap will widen as the wire ends melt further apart and soon the adjacent turns will be affected so the coil will eventually fail. 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. Place a clean piece of strong paper between the points, and with the points closed pull the paper out. I purchased this Lister D petrol (gasoline) engine that came on a trolley with an Aerograph air compressor. IMPORTANT. Rotate the armature and check that the contact-breaker assembly does not foul its housing. Dansk Lucas workshop instructions - magnetos 0000000016 00000 n specially-selected, top-quality, British-made This induces an EMF in the coil, which in turn causes a current to flow. Now that the slip ring has dried off, replace the pick-up(s). Nice work. a separate spring-loaded holder (Lucas) or hidden at the back of the contact breaker plate (BT-H). with a fixed register in the cam housing and with the advance/retard actuator). The voltage generated in the primary winding is a product of its velocity through the magnetic field and the strength of that field, so the condition of the magnet is vital for the correct performance of the magneto. Ensure that you have the proper gasket fitted. You should not let a Wico X go out the door if it will not jump more than 1/4" because something is wrong. Magneto advice - lucas rf4 in vedette engine | YBW Forum Check for any dirty marks on the paper. only for magnetos, but also classic motorcycle It uses a magneto and a transformer to make pulses of high voltage for the spark plugs. I worked on farm equipment for my last real service job from 2013 thru 2016. As the field collapses rapidly there is a large voltage induced (as described by Faraday's Law) across the primary coil. Thanks again. All These are prone to deterioration and the cause of many ignition faults. 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. It may not display this or other websites correctly. We provide i totally agree. If there are any, replace the pick-up. magnetos. Contact-breaker Re-installation and Points Setting. PDF LUCAS MAGNETOS - edknet.de slip rings and pick-ups for Lucas and BTH A simple magneto (an electrical generator using permanent magnets) is able to produce relatively low voltage electricity, however it is unable to produce the high voltages required by a spark plug as used in most modern engines (aside from diesel engines). instruments available for immediate use, and a 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. 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. Lucas magneto problems? NEW CHEAP solution to bad condensor Remove the pick-up(s) from the magneto taking care not to mislay the gasket(s). Undo the contact-breaker centre-screw and remove the contact-breaker assembly. You are probably loosing amperage through the jumper cables. detailed support we offer. Main-body Earth Brushes and Bearing Insulators: Some magnetos have an earth brush between the contact-breaker back-plate and the contact breaker housing.