Motorcycle Repair: 78hondamatic no spark, honda cb400t, stator coil

Question
no spark.coil is not geetin signal,red black going to cdi box has pulsating current coil wires both showing gtoundf

Answer
Loren, I am assuming you have a 1978 CB400A and not a 1978 CB750A here.....

I am going to reprint what I have posted before about Honda CDI ignitions for 400-450s from some guy on Ebay. It isn't exactly the King's English or very grammatical, but there are a few tidbits of appropriate information in it.

When I was working at a Honda shop in 1980, we saw a LOT of these bikes with ignition issues. The Honda rep figured that ALL of the stators on the Automatics would need to be replaced sooner or later.
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Honda CB400T ignition test information: from the cdimagician on Ebay
*The measurement of the Yellow and Green wire coming from the coil may not have a reading.
*The coil primary winding may have opened up.   This is an infinite resistance, meaning a bad ignition coil.
*The measurement of the Pink and Green wires going to the stator may not have a reading.  
*The coil in the stator may also open up. Resistance of the wires could be less than 135 ohms. *The coil could have shorted windings. Not enough energy will be developed in the stator coil for the ignition.   
*The measurement of the resistance of the White and Blue wires may not have a reading.  This coil on the stator may open up.   Resistance of the wires could be less than 85 Ohms.  Shorted windings in the stator coil will keep it from developing enough energy for the ignition.
*The measurement of the resistance of the Brown and Light Blue wires may not have a reading.  *The coil on the stator may open up. Resistance of the wires could be less than 207 Ohms.
*The black wire with the white stripe goes to the kill switch and key on the handle bar…...
*If the kill switch is on or the ignition switch is Off the black/white wire will be connected to the frame of the motorcycle.   
 0.0          Ohms resistance to the frame.  
The motorcycle will not start up,  ….or will shut down.
If the kill switch is OFF and the ignition is ON there will be no connection to the frame.  
The black/white wire resistance to the frame will be infinite or no reading on the meter.
With no connection to the frame,      the bike will start up,…. or will be running
Pulse generator test 50-170 ohms Blue/yellow to Green wires
Alternator charging coil measure between all three yellow wires .6 to 1.1 ohms between leads
Ignition coil primary windings .1 to .3 ohms Rebel 450 .55 to .65 ohms all others.
Ignition coil secondary windings 7,200 to 8,800 ohms Rebel 450, 7,400 to 11,100 ohms all others
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There are wiring diagrams at:
http://oldmanhonda.com/MC/WiringDiagrams/MCwiring.php#class

So, from the above info you are looking for primary coil readings of .55 to .65 so you will need an accurate VOM to measure.  Disconnect the KILL switch and the ignition switch and bump the motor over to see if either of those two are shorting out the ignition system output.
Look for 50-170 ohms Blue/yellow to Green wires.

More info/tips here:

http://www.electrosport.com/technical-resources/known-issues/common-tech-issue?m

Bill Silver