lucas magneto not sparkingstaff toolbox uca
Some original units are still in service today. Values vary considerably depending on the make and model of magneto and who wound it. Lucas Magneto 1930 - 1940. 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. 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. xref This could be because: the brush isnt projecting far enough to touch the slip ring, so check that as best you can. performance. The condensers we get now are made in area's that there are no or very poor quality control checks. As the magnet moves with respect to the coil, the magnetic flux linkage of the coil changes. Undo the contact-breaker centre-screw and remove the contact-breaker assembly. Replace the cam, ensuring that the notches in it engage as before (e.g. We always replace the capacitor during a repair as experience has show us that the capacitor tends to be the most unreliable part. Could be bad parts if spark just gets a lot weaker but if spark totally goes away when cap and rotor are installed, be sure the when you install them it does not short out the primary, give the rotor a closer ground to jump to or hold the points open, etc. -- misfiring, particularly at higher revs and fully open throttle, or when opening the throttle. Click on a button to see magnetos from other manufacturers Bosch BTH Others Click on any picture to get a larger view that more owners can not only maintain their magnetos, If not provided with a safety gap, there is a risk of expensive damage. A good Wico X series mag will jump at least 3/8" air gap. 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. British motorcycles on e-Bay North America, Powered by UBB.threads PHP Forum Software 7.7.5. 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. In the type known as a shuttle magneto, the engine rotates a coil of wire between the poles of a magnet. Regrettably, some Acrobat .pdf files might pouvons vous aider soit en franais, soit en U.S. agrees to $5 million settlement over police killing of Bijan In this series of pages, well take you through the main things. item. information aggregated from many sources. classic owners. Check out our magneto armature winding service. The contact points which are mounted onto the end of the armature shaft, used to time the breaking of the primary winding current, will become pitted and worn, especially so if the capacitor is faulty. When inserting the brushes; you may have to do. Lucas magneto problems? NEW CHEAP solution to bad condensor You should not let a Wico X go out the door if it will not jump more than 1/4" because something is wrong. On the Lucas magnetos, the spec is to jump a .200 gap at 200 rpm for the slow speed test. You are probably loosing amperage through the jumper cables. Hi group, It is summer in Denmark, nice but my Lucas KF2 Magneto do not like high temperatures. Your mag likely has a bad condensor. Brightspark Magnetos Ltd disclaims responsibility for any Will It Spark? I tested the HT wire and spark plug and both are fine. BTH mags utilized condensers made from mica. I can never stress this enough to people who try to test out their mags. grade to avoid carbon deposits on the slip to suit the needs of a customer. [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. Check for wear and replace any worn parts. errors in the translations. A short circuit absorbs all the power, hence no output or spark. Post in the forum instead. found elsewhere on the internet or in the B Magneto Help - No Spark - Britbike forum A second coil, with many more turns than the primary, is wound on the same iron core to form an electrical transformer. Please note: THEY ARE NOT FOR SALE! magneto electronic ignition conversion, repairs Lucas & BTH, 5 year 0 0000001320 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.) Rotate the armature and check that the contact- breaker spring never touches the cam. The reading will probably be a fraction of an ohm. If the pick-up is retained by spring clip, swing it to one side while holding the pick-up in place. If the brass is black, it indicates that the brush(es) are too soft and/or years of neglect. This can mask a fault on these cars as the vehicle will continue to run until the other fails. If not free to move, ease it. 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. The magneto is rebuilt by a reputable US shop. Now let the slip ring dry out with the pick-ups still removed. Put a smear of grease on the surface of the cam that engages its housing. Lucas (and most other) capacitors made in the 50's & 60's used a paper dielectric. troubleshooting your magneto. 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. 0000003777 00000 n Any high tension magneto will have way more than 7 ohms resistance on the secondary circuit. information as we can about the electrical equipment (Japanese) rebuilt amature runs about 85pnds from independent ignition. Pick-up brushes of the highest quality are also available, of the correct grade to avoid carbon deposits on the slip ring. Another cause of atom disorientation is mechanical shock, hammer blows or dropping the unit onto a hard surface, etc. any service or repair work until further notice. 0000001184 00000 n or The readings for the two plug caps should now be swapped around. With a multimeter, check the resistance between the tip of the pick-up brush and the terminal in the plug cap. https://www.smokstak.com/forum/attachment.php?attachmentid=294172&stc=1&d=1508717862. To have the discharge go arc back into the coil itself or the mag housing causes some serious damage. I highly doubt it is excessive unless someone has been grinding the rotor or the cap. Check that the advance/retard mechanism reliably rotates the cam back and forth. Upgrade your membership to load correctly in the translated versions of the pages. Such a system is known as an "energy transfer" ignition system. I'll try the 3/16" gap test. 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. 0000000016 00000 n Gift Article. 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. A short circuit absorbs all the power, hence no output or spark. When the magneto is supposed to fire, the flyweights are released by the action of the body contacting the trigger ramp. The older term "high-tension" means "high-voltage".[1]. Check that all the insulators are in good shape, and reassemble the contact breaker assembly. It is also used in modern piston-engined aircraft[citation needed] (even though a battery is present), to avoid the engine relying on an electrical system. Magnetic - Check magnetism and Remagnetise magneto body. The use of ignition magnetos is now confined mainly to engines without a battery, for example in lawnmowers and chainsaws. Repeat with clean pieces of petrol-moistened rag, until the rag comes out clean. 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. When screwed in the head, however, the plugs make no spark. Svensk 2. A small number of electrons is ever present and over years or decades this flow carves out an ever widening pathway through the insulation. 096792012013 - 2020 | Website design by The Net Effect of Sheffield, Website design by The Net Effect of Sheffield. The Magneto Guys - Vintage, Veteran, Classic Magneto Repairs 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. All Magneto services 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 Thank you for your patience. Magnetometer for measuring magnetic flux density at the centre of the armature cavity Measurement before remagnetisation Remagnetiser . IMPORTANT. Even if the points surfaces look good, clean them with fine emery cloth to remove any oxide layer. On the very first BSA I ever owned, I sufferred the same problem. 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. I also needed a new coil for it which I installed, cleaned the mag up and replaced any bits it needed. Points and contacts cleaned, and wires tested for continuity. NEW 0000001015 00000 n The air gap between the rotor and the cap actually increases spark output as long as it's not excessive. LUCAS Magneto check "How To" - Jockey Journal Forum Brightspark Magnetos Ltd disclaims responsibility for any errors I have seen several condensers during that time whichwork for the half but will not generate the field collapse andfire the plug . trailer [5], The first person to develop the idea of a high-tension magneto was Andr Boudeville,[citation needed] but his design omitted a condenser (capacitor). After you get your spark strong enough, then worry about cap and rotor. Lucas Magneto Bearing Shim Pack 15mm | E15 | N3048 | K1F | SR | K2F . It's a 6v system, so the starter turns rather slowly (maybe 80rpm), but I think it should be fast enoughto start. If sloppy, consider fitting a new moving point (Lucas), bush (BTH), or pivot post. Over time the HT leads can degrade and reduce the potential difference at the spark plug. Replace if necessary. Downloadable drawings, all for free, for 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 K1F MAGNETO RUNNING AT 1200 RPM AT THE ARMATURE. I know a great starting engine will fire a plug with 3/16" gap when external of a cylinder. [7] Ignition magnetos were soon was used on most cars, for both low voltage systems (which used secondary coils to fire the spark plugs) and high voltage magnetos (which fired the spark plug directly, similar to induction coil ignition).