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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern BTH Ignition
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<blockquote data-quote="greg brillus" data-source="post: 115382" data-attributes="member: 597"><p>I've not had many coil failures, that would generally happen from a HT lead not being connected at some point, like any HT system if there is no escape for the High tension spark, it will do some damage to the internal insulation on the secondary winding. This may happen at some point but not show up for some time down the track as it were. We recently had a failure of an earlier BTH mag that seems to have suffered a break in one of the internal wires. I could manage to get it to spark on the dead coil if I moved the wires, I could not replicate the problem, and it is too expensive to send for repair to the Uk, so it is resigned to the scrap bin. I have mentioned it on here before, but sometimes hard starting can be due to the outer end face of the internal pickup coils from getting a light coat of rust on here results in a poor pickup strength and that coil will fail to fire. A light buff to remove this coating will restore the mag to full operation again.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 115382, member: 597"] I've not had many coil failures, that would generally happen from a HT lead not being connected at some point, like any HT system if there is no escape for the High tension spark, it will do some damage to the internal insulation on the secondary winding. This may happen at some point but not show up for some time down the track as it were. We recently had a failure of an earlier BTH mag that seems to have suffered a break in one of the internal wires. I could manage to get it to spark on the dead coil if I moved the wires, I could not replicate the problem, and it is too expensive to send for repair to the Uk, so it is resigned to the scrap bin. I have mentioned it on here before, but sometimes hard starting can be due to the outer end face of the internal pickup coils from getting a light coat of rust on here results in a poor pickup strength and that coil will fail to fire. A light buff to remove this coating will restore the mag to full operation again. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Modern BTH Ignition
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