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Old Oct 8th 2018, 10:18 AM   #1
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Spark plug wires/coils

I知 trying to troubleshoot a recent failure. Short version, riding on track bike running great then all of a sudden bike looses power, backfiring like crazy. Limp back to pits and bike dies when I pull in clutch. Battery seems okay, I was able to get it to re-fire briefly but it only ran a short time and died. I知 home now and starting to trouble shoot. Pulled rear plug it doesn稚 look horrible but I値l replace because I知 here. Both coils test at .7ohms, but when I test the vertical cylinder wire I get infinite resistance and continuity testing shows no continuity. To me this looks like a bad wire, what sayethnthe rest of you?
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Old Oct 8th 2018, 02:34 PM   #2
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It looks like my vertical spark plug cap failed. I unscrewed the cap from the wire and it was fine. I tested the cap and it was an open circuit. I cut it open and found the cap assembly to have heavy carbon deposits which isolated the component. I cleaned and reassembled and now it has continuity and resistance of the cap is 5k ohms.
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Old Oct 8th 2018, 07:19 PM   #3
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Excellent, the best fixes are the cheap ones, only cost you a little elbow grease.
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