Wasn't the Carb, Wasn't the spark plug or wire - is it the coil?

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14 Jul 2006 18:18 #62043 by DawnKZ750
Okay, my #3 pipe is not getting hot. I changed all the spark plugs and yesterday I took the carbs off cleaned thouroughly and replaced the float needles and seats. I didn't really know what I was doing but I did it, and by the way if there are any ladies reading this - be careful b/c that carb cleaner really does a job on your nail polish. Any way, I was told that maybe the problem was the coil or wires. I switched my #3 wire with my #2 and #3 pipe still not getting hot so I guess it's not the wire. I just want to be sure that the problem is with the coil before I spend the money for a new one. Any help is greatly appreciated as I am new at all this. Thanks, Dawn :)

1982 KZ750-E
MASSACHUSETTS

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14 Jul 2006 18:24 #62045 by rdhussey
Have you checked for spark on your cold cylinder? Try it and pot the result :)

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14 Jul 2006 18:29 #62051 by DawnKZ750
How would I go about checking the spark? I drained the bowl and there's gas in there and the plug was wet. Sorry, as I said I don't have a lot of experience with bikes but I am learning.

1982 KZ750-E
MASSACHUSETTS

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14 Jul 2006 18:37 #62059 by steell
If the coil is bad it will have "two" dead cylinders, not one.

I'd do a compression check to verify the rings and valves are sealing before I went any farther. If one or more cylinders are down on compression my next step would be to check the valve clearances, but that should be done anyway.

Two much fuel will cause a cylinder not to fire, maybe the float level is to high on that carb.

Post edited by: steell, at: 2006/07/14 21:39

KD9JUR

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14 Jul 2006 18:38 #62060 by rdhussey
Take a spare spark plug, remove the spark plug cap from cylinder three nd press them together. Touch the bottom end of the extra plug on your engine and pres the starter. You should see a white or blue spark.

A all orange or no spark means your wire is gone ... WAY cheaper :)

Hope this helps!

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14 Jul 2006 19:27 #62071 by Duck
Is this a problem that has arisen since you acquired the bike?

A bad plug is not uncommon. I have purchased new ones that were bad.

Swap that #3 plug for a good one from another cylinder and see if the problem moves.

-Duck

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