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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
spark plugs
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<blockquote data-quote="Simon Dinsdale" data-source="post: 15686" data-attributes="member: 58"><p>John,</p><p>You are nearly correct, except for the polarity. You should have a negative going voltage on the center electrode and the earth electrode should be positive in regards to the center electrode. This is because the center electrode will then be the cathode and as electrons travel from negative cathode to positive anode (earth electrode) and so material will be removed from the center electrode to the earth electrode in the direction of electron flow. Making the center electrode out precious metal reduces this effect. This is why ignition coils have input polarities to ensure the outgoing polarity is negative. Please note this is independent to the polarity of the rest of the bikes electrics.</p><p></p><p>Cheers,</p><p>Simon.</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 15686, member: 58"] John, You are nearly correct, except for the polarity. You should have a negative going voltage on the center electrode and the earth electrode should be positive in regards to the center electrode. This is because the center electrode will then be the cathode and as electrons travel from negative cathode to positive anode (earth electrode) and so material will be removed from the center electrode to the earth electrode in the direction of electron flow. Making the center electrode out precious metal reduces this effect. This is why ignition coils have input polarities to ensure the outgoing polarity is negative. Please note this is independent to the polarity of the rest of the bikes electrics. Cheers, Simon. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
spark plugs
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