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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Spark Plug
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<blockquote data-quote="oexing" data-source="post: 168944" data-attributes="member: 1493"><p>For old magneto ignitions try to get spark plugs without resistor in the plug. Most of modern plugs got resistors in plugs and other places for electronic emiission control. But this produces weak sparks on Lucas gear. With Bosch Plugs it is marked as WR 7 on plugs , with R meaning resistor. So when in doubt , check plugs for nil resistance . Otherwise I do not buy OWTs about fake plugs all over the place. My guess, riders keep buying handbook plugs with unsuitable grade for their kind of ride today - which is mostly just pottering around . And from this they get black sooty plugs with troubles then. </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 168944, member: 1493"] For old magneto ignitions try to get spark plugs without resistor in the plug. Most of modern plugs got resistors in plugs and other places for electronic emiission control. But this produces weak sparks on Lucas gear. With Bosch Plugs it is marked as WR 7 on plugs , with R meaning resistor. So when in doubt , check plugs for nil resistance . Otherwise I do not buy OWTs about fake plugs all over the place. My guess, riders keep buying handbook plugs with unsuitable grade for their kind of ride today - which is mostly just pottering around . And from this they get black sooty plugs with troubles then. Vic [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Spark Plug
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