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Old 01-05-2009, 03:03 PM   #1 (permalink)
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Running on one cylinder

My 1984 Yamaha Phazer is running on one cylinder. I have already put new plugs in and a new ignition coil. The cylinder is getting gas because it is very wet but not firing. I assume that it is an electrical problem but am having a very hard time determining what it may be. Any advice would be greatly appreciated.
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Old 01-05-2009, 09:37 PM   #2 (permalink)
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Are you SURE it's not firing? Use an inline spark tester to verify.
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Old 01-05-2009, 10:26 PM   #3 (permalink)
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I am sure it is not firing because it sounds like my yamaha bravro. I have also taken the cap off of the bad plug to see if there is any change. I am 100% positive it is running on one cylinder, I just can't figure out why. Any help or suggestions are appreciated.
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Old 01-06-2009, 06:45 AM   #4 (permalink)
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I understand that. I need to know if there is actually spark on that plug wire. Check it with an inline spark tester.
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Old 01-06-2009, 12:05 PM   #5 (permalink)
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There is no spark on that plug. What route would you suggest I take?
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Old 01-07-2009, 07:39 AM   #6 (permalink)
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Replace that coil. If you already did, did you replace the spark plug boot or reuse the old one?
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Old 01-07-2009, 07:43 PM   #7 (permalink)
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The spark plus boots were replaced along with the coil. Could it be the CDI? I just really have no idea what to do beyond replacing the ignition coil.
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Old 01-08-2009, 05:29 AM   #8 (permalink)
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The CDI serves BOTH cylinders, so if it was bad, the sled would not run. Assuming you did indeed use a spark tester, I don't know what's next. Did you do a compression test to be sure the compression is OK?
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