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Post by racerx125 on Aug 25, 2014 15:07:38 GMT -6
well recently I got a free 1980 CM400A 9k miles with (auto transmission??? Huh?) well I tried to start it and no go I changed the oil, oil filter, spark plugs, fuel,and cleaned the carb the hell out of it because the jets got clogged because it was sitting for about 4 years outside just rotting away. Anyways I did got it started for once and idled just perfectly but when I turned it off it wouldn't start again at all. I tried to test my coild and not sure of I did it right as I set the multimeter to 200 ohms setting I get 02.6 ohms in small wire that powers the coil and then set to 20k ohms on the spark plug wires with cap removed ofcourse I get nothing the number doesn't change it just says 1 :S can the coild be bad?
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Post by cyborg on Aug 25, 2014 19:15:42 GMT -6
I have done a few long left out side bikes and it pays to get a small wire brush like a toothbrush size and a small file,,, tiny like a jewelers file and som 320-400 sand paper and go over every connection ,,, even if it looks good,, and check grounds as well,,, you may find your problem will disappear ,,, and I do mean every connection
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Post by racerx125 on Aug 25, 2014 19:19:52 GMT -6
the connector for the coil has its own ground connected to the cdi and I what i wanted to know is if the ohms test is normal?
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Post by cyborg on Aug 25, 2014 19:31:32 GMT -6
If it fired the first time my money is on intermittent connections ,,, go thru all your connections and I'm sure you'll have success,,, oh and congratulations on a good score,,,
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Post by racerx125 on Aug 25, 2014 20:53:13 GMT -6
good score as in the coil check to be working?
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Post by Bashan on Aug 25, 2014 21:35:52 GMT -6
You should get very little resistance off of the primary coil which is between the two connections on the back of the coil.....maybe 1 ohm:
The secondary should give you more, around 7 to 9K ohms I would think. Now, I'm just guessing based on scooters, but much off of that would be a problem I think. I'd swap the coil. Rich
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Post by racerx125 on Aug 25, 2014 22:37:30 GMT -6
well as I mentioned on the first post the secondary doesn't give any reading and the primary says now 03.6 ohms O.o
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Post by Bashan on Aug 25, 2014 22:53:53 GMT -6
The secondary is burnt, you should get something. Replace the coil.
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Post by racerx125 on Aug 25, 2014 23:19:50 GMT -6
Well After intensive searches and testing I got nowhere so I just went to autozone and bought a repair manual and it seems I was doing the test wrong Now it shows 7.6k resistance on the coil which is in good shape. I probably should of mentioned that the coil has 2 spark plug cables in just the 1 coil and to check resistance you must check in spark plug cable to cable :S and now I have readings!
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Post by Guitarman on Aug 26, 2014 4:02:07 GMT -6
The primary reading in the pix above is normally between 3 and 5 for a regular motorcycle.
The secondary should be lower than 20.
These readings are for a regular motorcycle coil, (Honda, Zook, Yammer) I don't have the specs for 250cc or less but I would think it shouldn't be that much different.
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