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. 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. 0000006861 00000 n While holding it in that position, tighten the centre screw, but do not use undue force. Do not skimp on quality with pick-up brushes. Built into the case of the magneto are magnets, permanent magnets. DIY Magneto Maintenance and Troubleshooting rebuilt amature runs about 85pnds from independent ignition. Copyright 2023, Antique Automobile Club of America. a separate spring-loaded holder (Lucas) or hidden at the back of the contact breaker plate (BT-H). If the magnet is full strength and the spark at the points looks right then I would still say you have a coil problem with some shorted turns or something. Others have an earth brush between the main body of the magneto and an earth track of the armature. Replace if necessary. Espaol -- misfiring, particularly at higher revs and fully open throttle, or when opening the throttle. downloadable drawings for those of you who The older term "high-tension" means "high-voltage".[1]. 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. 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transformer coil rewound as modern class F or H wires and insulations are superior to the ones used at the time it was originally made and would almost certainly give you another 40 years of good service. 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; . So, re-check everything in the contact-breaker assembly first before deciding on a more complete overhaul. This expediential degradation may appear to be sudden when the fault occurs. 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. This induces an EMF in the coil, which in turn causes a current to flow. Don't want this buried as I 'm hoping for some possible answers today. rectifiers (and wiring diagrams) of use to all load correctly in the translated versions of the pages. have a small choice of reconditioned Click Here to view Lucas face cam (magdyno) parts manual. Another cause of atom disorientation is mechanical shock, hammer blows or dropping the unit onto a hard surface, etc. Reassemble and check operation. At atmospheric pressure, the voltage required to strike a spark across the 0.020 (0.5 mm) gap of a sparking plug is far less than the voltage required at the elevated pressure that the plug experiences in the engines cylinder. That then produces a gap of about 4 mm between the centre electrode and the screw-threaded bit of the plug body. All rewound units now have modern condensers and enameled wire. An ignition magneto (also called a high-tension magneto) is an older type of ignition system used in spark-ignition engines (such as petrol engines). VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. However, typical signs of magneto problems are, among others: -- Bike hard to start. Brightspark Magnetos Ltd disclaims responsibility for any errors Grease. For a better experience, please enable JavaScript in your browser before proceeding. This allows the spring to unwind giving the rotating magnet a rapid rotation and letting the magneto spin at such a speed to produce a spark. BTH mags utilized condensers made from mica. Then check that the contact-breaker assembly is not wobbly on the end of the shaft. Take a look In that case, it it best to dismantle the magneto to retrieve it. Thank you for your patience. 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. This disables the magneto to reduce the risk of electric shock and fire. "A Community of Antique Engine Enthusiasts." 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. 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 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. yourselves. For example, in the Lucas K1F and K2F, the earth brush is located on top inboard of the main mounting flange. Franaise I'd need to install it in the chassis or rig up something to do that. Regrettably, some Acrobat .pdf files might Remove the pick-up(s) from the magneto taking care not to mislay the gasket(s). Not sure what came off, but 1930s/40s I would have thought.prefer collection, but would post. The timing marks should not wander with the RPM of the drill. ZK~!c. Lucas Magneto 1930 - 1940. asked questions, some of which isn't to be The magneto is rebuilt by a reputable US shop. The engine needed some attention, which it has now received, but I had to take the magneto off. Voltage across the primary coil results in a proportional voltage being induced across the secondary winding of the coil. I also needed a new coil for it which I installed, cleaned the mag up and replaced any bits it needed. 0000001320 00000 n 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. 0 Come join the discussion about performance, restorations, modifications, classifieds, troubleshooting, maintenance, and more! 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. You are probably loosing amperage through the jumper cables. In early magnetos the magnets were formed from a cobalt material and had to be remagnetised if the armature was ever removed. JRC Engineering Inc. 3110 Indian Ave Unit 1E, Perris, CA, 92571. If not provided with a safety gap, there is a risk of expensive damage. Franaise Deutsch Mechanical - Bearings, insulation, washers and shimming the armature. If you have identified the magneto as the source of your ignition fault send it to us for repair. This was diagnosed as the cam ring not being properly timed to the magnetic poles. insulators; and timing discs. pages on how to do that. 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. DO NOT ATTEMPT THIS IF YOU ARE FITTED WITH A PACEMAKER, OR HAVE A HEART CONDITION, OR IF YOU REALLY HATE ELECTRIC SHOCKS. 0000002847 00000 n If you do, then replace the pick-up. To contact injunmort simply click on his name and the forum will display his e-mail address, Helge. 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. Our If necessary, dress the points on a fine stone. Check for any dirty marks on the paper. themselves. Check that the advance/retard mechanism reliably rotates the cam back and forth. The condensers we get now are made in area's that there are no or very poor quality control checks. 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. [6], The first car to use magneto ignition was the 1901 German Mercedes 35 hp racing car, followed by various cars produced by Benz, Mors, Turcat-Mery, and Nesseldorf. If there are any, replace the pick-up. Because the magneto has low voltage output at low speed, starting an engine is more difficult. Another problem, due to constant hot, cold, expansion, contraction, vibration or mechanical impact, is breakage of the fine winding wire. LUCAS K1F MAGNETO RUNNING AT 1200 RPM AT THE ARMATURE. The readings for the two plug caps should now be swapped around. only for magnetos, but also classic motorcycle [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. Posts: 34. If it is significantly lower, then there is probably a short-circuit in the contact-breaker assembly or in the armature. errors in the translations. If the magneto is fitted with, or about to be fitted with, a Brightspark EasyCap, you can perform some basic checks on the EasyCap. Measure the resistance between the magneto body and terminal in the plug cap. If there is a quickly-detachable connection between the HT lead and pick-up, undo it and check the condition of the connection. demand to 'perfectly functional' or 'as-new' The impulse coupling uses a spring, a hub cam with flyweights, and a shell. In the late 1890s, English engineer Frederick Richard Simms and German engineer Robert Bosch developed the first practical high-tension magneto. By This video details the work done to the magneto so far. i have had 3 done here by ed strain that included rebuild with remagnatized body for a little more than $200.00. Over time the HT leads can degrade and reduce the potential difference at the spark plug. It should fit properly in only one precise position. It's easy! A small number of electrons is ever present and over years or decades this flow carves out an ever widening pathway through the insulation. magneto electronic ignition conversion, repairs Lucas & BTH, 5 year (Chinese) Nederlandse We also have kits for more unusual magnetos, such as the BTH, ML, Magnetos France, Morel, Lucas wader, Lucas KVF, etc., and for cars. but enjoy doing it, with confidence, relying on the 0000001184 00000 n This can mask a fault on these cars as the vehicle will continue to run until the other fails. With other models, it may be inaccessible while the magneto is in situ, for example underneath. Gift Article. Check the state of the points surfaces. Check out our magneto armature winding service. classic owners. Lucas magneto problems? NEW CHEAP solution to bad condensor V-TWINS Magnetos are always a compromise, usually producing a strong spark to one cylinder and a weaker one to the other. at some of the equipment we use in our workshop for magneto servicing grade to avoid carbon deposits on the slip 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. old condenser to be disconnected. You must log in or register to reply here. However, dont make them lop-sided. However, provided the reading is more than about 500 ohms, it is probably OK. Links to other service providers can be found 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. Remove the cam, carefully noting which way round it goes and which notches in it engage where. Pick-up brushes of the highest relating to our products, others more general Initial installation does require the 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. You need to be a member in order to leave a comment. If you need more information, or wish to order by post or pay over the phone, please ring: 01273 913181. If the pick-up is retained by spring clip, swing it to one side while holding the pick-up in place. Put a smear of grease on the surface of the cam that engages its housing. 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 worked on farm equipment for my last real service job from 2013 thru 2016. item. 0000002409 00000 n Brightspark Magnetos - Home Will It Spark? 0000013093 00000 n 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. that old problem, the deeply-buried condenser and just how were you able to find one of those bastards that still worked?!?!?! English https://www.smokstak.com/forum/attachment.php?attachmentid=294172&stc=1&d=1508717862. On more advanced magnetos the cam ring can be rotated by an external linkage to alter the ignition timing. This disables the magneto to reduce the risk of electric shock and fire. I think it may be do to condensor failure. NEW On many Rolls Royce models there is a dual ignition system. And a f-ing video! The capacitor and the coil together form a resonant circuit which allows the energy to oscillate from the capacitor to the coil and back again. Can you rig up real cables? pouvons vous aider soit en franais, soit en Coil may still function somewhat and not completely failed but ratio of turns lost because of insulation breakdown. - there's a lot of stuff in our frequently
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