0000005952 00000 n In the inductor magneto, the magnet is rotated and the coil remains stationary. I also want to wire up the battery better, as I'm just using jumper cables. 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. magneto electronic ignition conversion, repairs Lucas & BTH, 5 year With a multimeter, check the resistance between the tip of the pick-up brush and the terminal in the plug cap. rebuilding magnetos and of how to extract an Capacitors, which are short-term storage devices, often fail in older magnetos due to dielectric degradation (short circuit) or conductor breakage (open circuit). You must log in or register to reply here. I'd need to install it in the chassis or rig up something to do that. [3] The capacitor's function is similar to that of a snubber as found in a flyback converter. insulators; and timing discs. LUCAS MAGNETO TROUBLESHOOTING | JRC Engineering, Inc. Regrettably, some Acrobat .pdf files might not This was diagnosed as the cam ring not being properly timed to the magnetic poles. Magneto advice - lucas rf4 in vedette engine | YBW Forum dynamos, regulators, alternators and Remove the cam, carefully noting which way round it goes and which notches in it engage where. 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. Franaise 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. So, re-check everything in the contact-breaker assembly first before deciding on a more complete overhaul. With the points fully open, adjust the points gap to 0.012 (0.3 mm). 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 you havent already done so, undo the contact-breaker centre-screw and remove the contact-breaker assembly. March 21, 2020 in Technical. This could be because: the brush isnt projecting far enough to touch the slip ring, so check that as best you can. In either case, the magneto needs a more complete overhaul. demand to 'perfectly functional' or 'as-new' Comment Guidelines: Do post respectful and insightful comments. It should fit properly in only one precise position. Thanks mmcdonald, all good info. 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. Thank you for your patience. On more advanced magnetos the cam ring can be rotated by an external linkage to alter the ignition timing. DIY Magneto Maintenance and Troubleshooting books. As the voltage of the primary winding rises to several hundred volts,[3][4] the voltage on the secondary winding rises to several tens of thousands of volts, since the secondary winding typically has 100 times as many turns as the primary winding.[3]. Do similar tests with the HT lead(s) and the plug-cap(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. Regrettably, some Acrobat .pdf files might Make sure they are there and can move in their holders and give them a good clean. If youre giving your magneto a thorough check over, we suggest you tackle jobs in the order shown. If the magneto is fitted with, or about to be fitted with, a Brightspark EasyCap, you can perform some basic checks on the EasyCap. Brightspark Magnetos - Home to suit the needs of a customer. Recommendations for Lucas K2FC magneto rebuild? - Britbike forum Then wash the points with petrol and dry them. "A Community of Antique Engine Enthusiasts." 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. The likely culprits are: Set the timing of the ignition in accordance with the machines handbook. Svensk There is no wire hooked up to the cap. It uses a magneto and a transformer to make pulses of high voltage for the spark plugs.The older term "high-tension" means "high-voltage".Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil . We also provide Check for wear and replace any worn parts. BTH mags utilized condensers made from mica. 0000001015 00000 n information aggregated from many sources. Norsk If the pick-up is retained by spring clip, swing it to one side while holding the pick-up in place. 096792012013 - 2020 | Website design by The Net Effect of Sheffield, Website design by The Net Effect of Sheffield. If excessively worn, replace the heel (BTH), or the moving-point assembly (Lucas). downloadable drawings for those of you who Take a look at some of the equipment we rectifiers (and wiring diagrams) of use to all The plugs all light when loosened, but not when installed. With a twin, repeat with the other pick-up. Mechanical - Bearings, insulation, washers and shimming the armature. Copyright 2023, Antique Automobile Club of America. long practical experience of working on magnetos and I would also welcome information on some of the things shown in the video such as the handles on the trolley. -- misfiring, particularly at higher revs and fully open throttle, or when opening the throttle. I can never stress this enough to people who try to test out their mags. 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. Timing Lucas K2F and K2FC Magneto | Jockey Journal Forum Used on many cars in the early 20th century, ignition magnetos were largely replaced by induction coil ignition systems. Great post! Language links are at the top of the page across from the title. -- Tickover, pulling away, and low-speed running erratic. In the type known as a shuttle magneto, the engine rotates a coil of wire between the poles of a magnet. The spark is fine on this coil, keep in mind the faster you turn a mag, the better the spark. I did run the rpm up with my lathe to 1,000 rpm & it easily jumped 5/8", so were good there, SMOKSTAK is a Registered Trade Mark in the U.S. Fantastic! 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. If I was working on it, first I would want a 5/16" air gap consistent spark minimum from the coil terminal to ground. 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. In this series of pages, well take you through the main things. specially-selected, top-quality, British-made The points surfaces should be very slightly convex, so dont worry about getting them perfectly flat. This disables the magneto to reduce the risk of electric shock and fire. I purchased this Lister D petrol (gasoline) engine that came on a trolley with an Aerograph air compressor. If not free to move, ease it. %%EOF When inserting the brushes; you may have to do. Then check that the contact-breaker assembly is not wobbly on the end of the shaft. Thanks. I have seen that a lot on FM mags. Once the insulation has been broken down once, it often makes it easier for it to be broken down again. a separate spring-loaded holder (Lucas) or hidden at the back of the contact breaker plate (BT-H). I worked on farm equipment for my last real service job from 2013 thru 2016. Voltage across the primary coil results in a proportional voltage being induced across the secondary winding of the coil. i totally agree. Joined: Oct 2009. 2,330 views Oct 18, 2020 16 Dislike Share Air Fuel Mixologist 1.31K subscribers I purchased this Lister D petrol (gasoline). 0000000783 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. Lucas magneto problems? NEW CHEAP solution to bad condensor 0000003162 00000 n Nederlandse The Fora platform includes forum software by XenForo. Electrics & Ignition | SRM Classic Bikes Twirl the armature. 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. 82 0 obj<> endobj You need to be a member in order to leave a comment. Many should appreciate. British motorcycles on e-Bay North America, Powered by UBB.threads PHP Forum Software 7.7.5. Magneto services Put a smear of grease on the surface of the cam that engages its housing. On the very first BSA I ever owned, I sufferred the same problem. Main-body Earth Brushes and Bearing Insulators: Some magnetos have an earth brush between the contact-breaker back-plate and the contact breaker housing. If not provided with a safety gap, there is a risk of expensive damage. 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).