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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas Mag
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<blockquote data-quote="greg brillus" data-source="post: 29298" data-attributes="member: 597"><p>Hi there, i'm assuming it's a magdyno.....first check that the spark plug is in good condition with no more than an 0.018" thou plug gap and check that the HT lead is in good order, that is, not oil soaked or damaged. Next i think from memory a magdyno doesn't have a safety gap built into it, which is like a safety fuse for the high tension voltage to escape to if the HT lead came off the plug. So if you can get to it, pop the pick up out of the side of the mag and have a good look at the slipring, perhaps rotate the engine slowly whilst cleaning the slipring with a bit of petrol on a rag. There is a good chance that you may see either a piece missing or a crack in it, or it could be just badly worn. Any of these faults will cause the missfire you describe, as the spark is always trying to find the easiest path to an earth. Hope any of this helps, cheers......Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 29298, member: 597"] Hi there, i'm assuming it's a magdyno.....first check that the spark plug is in good condition with no more than an 0.018" thou plug gap and check that the HT lead is in good order, that is, not oil soaked or damaged. Next i think from memory a magdyno doesn't have a safety gap built into it, which is like a safety fuse for the high tension voltage to escape to if the HT lead came off the plug. So if you can get to it, pop the pick up out of the side of the mag and have a good look at the slipring, perhaps rotate the engine slowly whilst cleaning the slipring with a bit of petrol on a rag. There is a good chance that you may see either a piece missing or a crack in it, or it could be just badly worn. Any of these faults will cause the missfire you describe, as the spark is always trying to find the easiest path to an earth. Hope any of this helps, cheers......Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Lucas Mag
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