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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Electronic Speedos?
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<blockquote data-quote="greg brillus" data-source="post: 100063" data-attributes="member: 597"><p>A couple of tips when using these types of instruments..........They do not like any electrical interference from a HT source, say you have the speedo magnetic pickup on the rear wheel, and the sensor wire running up the frame past or near the ignition leads/coils this will upset the speedo reading big time. It effectively tries to become a Tacho instead..........Keep the sensor wire away, as a last resort you might need to use some 5 K ohm resistor plug caps, and this works very well. Another point is that some of these electronic Tacho's can reek havoc with some electronic ignitions, especially if the pickup wire used is the one that is tapped to the negative side of the ignition coils. The problem that exists is that a lot of electronic ignitions trigger the coils from the positive side of the coil, not the negative like you would for points ignition. The wire from the electronic tacho has a small voltage feed coming from it (say 5 volts on a 12 volt system) this backfeed of voltage to the negative side of the coil causes grief and can in many instances destroy the ignition coil. Don't ask me how I found this out on a 600 Comet, it caused many headaches to find the fault. Cheers..........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 100063, member: 597"] A couple of tips when using these types of instruments..........They do not like any electrical interference from a HT source, say you have the speedo magnetic pickup on the rear wheel, and the sensor wire running up the frame past or near the ignition leads/coils this will upset the speedo reading big time. It effectively tries to become a Tacho instead..........Keep the sensor wire away, as a last resort you might need to use some 5 K ohm resistor plug caps, and this works very well. Another point is that some of these electronic Tacho's can reek havoc with some electronic ignitions, especially if the pickup wire used is the one that is tapped to the negative side of the ignition coils. The problem that exists is that a lot of electronic ignitions trigger the coils from the positive side of the coil, not the negative like you would for points ignition. The wire from the electronic tacho has a small voltage feed coming from it (say 5 volts on a 12 volt system) this backfeed of voltage to the negative side of the coil causes grief and can in many instances destroy the ignition coil. Don't ask me how I found this out on a 600 Comet, it caused many headaches to find the fault. Cheers..........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Electronic Speedos?
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