Hi all, got this capture this week from a Honda VTR1000 which i had just fitted 2 new genuine coils to as the old coils had failed and i was curious about the waveform it generated, Both cylinders are the same and primaries obviousley follow. All are included in the psdata file if you want to see them.

I am looking to understand why this waveform woudl look like it does. This is a CDI ignition system, wasted spark and carb'd fuel delivery. Carbs have just been gone through and bike runs fine so no concerns other than this was not what i was expecting to see  [smiley=huh2.gif]

Although i have seen this before with other CDI ignitions like this Honda XR70 and it has the same characteristics.

My question is how can i analyse theese waveforms like i would a "regular" secondary capture to see burn time and coil oscillations etc etc [smiley=scratch-head02.gif]

Thanks in advance for any input

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Olly wrote on Nov 19^th, 2014 at 9:00pm:

My question is how can i analyse theese waveforms like i would a "regular" secondary capture to see burn time and coil oscillations etc etc

I have never played with a CDI ignition system so I wouldn't be of much help there but you may want to check out the HD board as some of the CNG cummins run a CDI ignition system, just a thought.

http://www.autonerdz.com/cgi/yabb2/YaBB.pl?num=1379287230

What you could do is (if time permits) have a play on a known good system by changing fuel mixtures, add resistance to the secondary with a inline spark tester or a adjustable spark tester and save the captures and study what you see.

You will get variations from different engine types but you will start to understand what you are looking at after some practice.

One suggestion would be put a bit more time on the screen (1-2 sec/div, 10 to 20 second screen time) and do idle snap and back to idle again.

Cool thanks Anthony, I will when I get more time have a play with some cdi systems and see if I can get a better idea of how these may be analyzed and post somewhere here, for future reference.