Question about 1990 kawasaki ZXR 750

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ZXR250 CDI PROBLEM

Hi, my 1990 zxr250 is only getting power to one coil, switched coils and same thing. Im led to believe this could come down to the CDI box! Has anyone successfully fixed this prob??

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Hi and welcome to FixYa,

If somehow, the CDI could be opened up, then component level repair maybe tried. There would be 2 final transistors that actually do the switching; 1 for each coil. Offhand, it would appear that 1 of those 2 is faulty. Otherwise, replacement is the only option.

Incidentally, in some versions, a fault in the tachometer could also cause one of the CDI's output to fail.

Postback results of tests.

Good luck and thank you for using FixYa.

Posted on May 28, 2009

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Posted on Jan 02, 2017

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I am not getting spark on my 1997 suzuki bandit 1200s, there is a weak spark for a second then it stops and nothing, it will crank over fine, im almost positive its not my coil packs as i had a known good...


Hi and welcome to FixYa,

Just to verify and eliminate the ignition coils, tests for it are:
  • one terminal would have an IGN +12;
  • the other terminal would have a pulsating voltage when cranking;
  • passive test, primary (+ to -), resistance 3 ~ 5 ohms; while
  • any of the primary terminal to HT would be 15 ~ 18 kilo ohms.
The CDI could not be tested since it is a sealed unit. The only way to confirm if it is a CDI is to check the external factors and if they are present yet no spark, then it would be the CDI:
  • the CDI gets its triggers from the pulser coils;
  • the output of the pulser coils would be very very low ACV;
  • it would be preferable to use an analog/needle type multitester for the flickering pulser voltage;
  • the CDI also needs a "go signal" from the interlocks together with the starter relay;
  • try exercising the sidestand when cranking;
  • verify neutral light is on;
  • try starting with the clutch lever pulled.
Another possibility to consider is that the starter is consuming most of the power from the battery leaving very little for the ignition system to use and/or the ignition switch has some loose connection. The IGN +12 to the coil terminal should also test this possibility.

Please postback results / updates of tests performed.

Good luck and thank you for using FixYa.

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Hi,

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Since the pickup coils are new, and you have swapped the ignition coild, replace the high tension wires and checked/replace the spark plugs, the the only cmponent left is the CDI (electronic ignition system).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

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