lucas magneto not sparking

anglais, votre convenance. 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). ZK~!c. If you havent already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. 0 This can mask a fault on these cars as the vehicle will continue to run until the other fails. Take a look at some of the equipment we Free access to service and repair 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. 0000006861 00000 n I do not know it all but I will try to help. Remove the pick-up(s) from the magneto taking care not to mislay the gasket(s). Voltage across the primary coil results in a proportional voltage being induced across the secondary winding of the coil. If I was working on it, first I would want a 5/16" air gap consistent spark minimum from the coil terminal to ground. If the resistance is higher than about 15,000 ohms, it indicates a bad connection. 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. After a full rebuild my motor started right up, rode for 5 minutes, stopped, no spark. Also, some pattern contact-breaker assemblies are too large at the fat end and need to be filed or ground to size. replace it with an EasyCap. The Lucas magdyno and magneto units fitted to all AMC machines after 1939 had Nifal magnets which are not demagnetised by removal of the armature. This is really common on original units as the Lucas condensers were made from wax paper and foil. Thank you for your patience. The condensers we get now are made in area's that there are no or very poor quality control checks. I did notice a very small spark between the contact breaker points. Clean and grease the moving-point pivot. 82 23 This disables the magneto to reduce the risk of electric shock and fire. 0000003086 00000 n 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. NEW When we undertake the renovation of these magnetos, we examine the following:-. 82 0 obj<> endobj classic owners. With the Lucas KN1, it is under the identification tag. If there is a lubricating felt, soak it in oil. If they look good I would replace the condenser if it has one and retest. Dansk 0000001913 00000 n (Chinese) Great write up, with video even! Even if the points surfaces look good, clean them with fine emery cloth to remove any oxide layer. Espaol Turn the armature in its proper direction of rotation until the contact-breaker points are just starting to open on the other cam lobe. 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. Posts: 34. 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. If there are any, replace the pick-up. 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. a separate spring-loaded holder (Lucas) or hidden at the back of the contact breaker plate (BT-H). PA. Your mag likely has a bad condensor. We shall resume operations as soon as we possibly can. Another cause of atom disorientation is mechanical shock, hammer blows or dropping the unit onto a hard surface, etc. Language links are at the top of the page across from the title. The irony here is that usually these magnetos fail to spark. Initial installation does require the 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). The other plug cap should give a reading that is infinite (OL) or extremely high. While holding it in that position, tighten the centre screw, but do not use undue force. 0000005952 00000 n Magnetic - Check magnetism and Remagnetise magneto body. With other models, it may be inaccessible while the magneto is in situ, for example underneath. 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. not load correctly in the translated versions of the pages. here. Ensure that you have the proper gasket fitted. Problems rooted in the magneto are sometimes obvious, or can seem like all sorts of other things. 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. March 21, 2020 in Technical. If you are sure that all earth brushes are removed, and if either the magneto has a fibre drive pinion or the drive pinion/sprocket has been removed, you can now check the effectiveness of the bearing insulators. I pulled my B34 out after the winter and could not get it started. sequences illustrating the importance of Reassemble and check operation. Rotate the armature and check that, when the points are fully open, the moving point assembly is not fouling anything. trailer BTH mags utilized condensers made from mica. He got it and thought the ring the points rides in came out and just needed pushed in. However, if the outside of the pick-up is also oily, perhaps its all caused by an engine oil leak. Due to the inevitable losses in the system, this oscillation decays fairly rapidly. 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. Rotate the armature until the contact-breaker points are open. I also want to wire up the battery better, as I'm just using jumper cables. Main-body Earth Brushes and Bearing Insulators: Some magnetos have an earth brush between the contact-breaker back-plate and the contact breaker housing. 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. If you have an auto-ranging meter, the reading might jump about a bit on the way while it changes scales. With BTH devices, if the moving point assembly fouls the eccentric pin, the pin will need to be adjusted. "Colonel fair is fair: if I nail Hotlips and punch Hawkeye can I go home too?". instructions). Copyright 2023, Antique Automobile Club of America. 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. This induces an EMF in the coil, which in turn causes a current to flow. The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. With a multimeter, check the resistance between the tip of the pick-up brush and the terminal in the plug cap. Once the insulation has been broken down once, it often makes it easier for it to be broken down again. 0000002602 00000 n You need to confirm that the condenser has failed AND that replacing it will solve the problem. of which is the product of Brightspark Magnetos Ltd's 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. wish to 'demystify and simplify' wherever we can, so heavier the better. If not provided with a safety gap, there is a risk of expensive damage. The plugs are non resistor, gaped at -025", and are new. I would narrow the plug gaps to .020" and see what happens. The reading should be substantially the same as the reading you obtained in the internal HT continuity section. ring. 0000004414 00000 n Take a look 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. 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. 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. We are unfortunately not able to offer In the inductor magneto, the magnet is rotated and the coil remains stationary. 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. and overhauls. Lucas vertical magneto in good condition and sparking. I do not think this is your issue because the timing light does not trigger. Not sure what came off, but 1930s/40s I would have thought.prefer collection, but would post. xref Contact-breaker Re-installation and Points Setting. only for magnetos, but also classic motorcycle 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. have a small choice of reconditioned magnetos and capacitors (for those who wish to Put a smear of grease on the tappet shaft. 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.

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