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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How To Remove Kill Wire From Inside B-TH Electonic
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<blockquote data-quote="Simon Dinsdale" data-source="post: 173389" data-attributes="member: 58"><p>Carl</p><p>The reports of the kill wire causing problems are not due to grounding against the HT leads. The problem is <strong>IF </strong>the kill wire runs up the side of the HT lead then RF noise from the HT leads when the plug sparks can feedback down the kill wire and cause electrical interference with the electronics inside the BTH. If you use resistor spark plugs they will reduce the RF interference a little bit, but they will not eliminate it.</p><p></p><p>So if you have run the kill lead up the side of the HT leads then the easy test is disconnect it from your kill button on the handlebars and position the kill wire well away from the HT leads, I.e downwards and onto the floor under the bike. Then try starting the bike and if suddenly it runs ok then you have probably found at least one problem and only then can you look at removing or redirecting the kill wire.</p><p></p><p>I believe later BTH uses a kill wire that has RF earth shield built in just like a smaller version of the coax cable used for TV Ariel leads. Even with that though it’s still not good electrical practice to run it alongside the HT leads.</p><p>When I used a BTH I ran the kill wire under the engine and up the back of the gearbox and then into the wiring harness So away from the HT leads. To mechanically protect the wire under the engine I ran it inside a small diameter copper tube mechanically secured to the engine.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 173389, member: 58"] Carl The reports of the kill wire causing problems are not due to grounding against the HT leads. The problem is [B]IF [/B]the kill wire runs up the side of the HT lead then RF noise from the HT leads when the plug sparks can feedback down the kill wire and cause electrical interference with the electronics inside the BTH. If you use resistor spark plugs they will reduce the RF interference a little bit, but they will not eliminate it. So if you have run the kill lead up the side of the HT leads then the easy test is disconnect it from your kill button on the handlebars and position the kill wire well away from the HT leads, I.e downwards and onto the floor under the bike. Then try starting the bike and if suddenly it runs ok then you have probably found at least one problem and only then can you look at removing or redirecting the kill wire. I believe later BTH uses a kill wire that has RF earth shield built in just like a smaller version of the coax cable used for TV Ariel leads. Even with that though it’s still not good electrical practice to run it alongside the HT leads. When I used a BTH I ran the kill wire under the engine and up the back of the gearbox and then into the wiring harness So away from the HT leads. To mechanically protect the wire under the engine I ran it inside a small diameter copper tube mechanically secured to the engine. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
How To Remove Kill Wire From Inside B-TH Electonic
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