Some of you may find this interesting even thou I am not sure how much you run into Capacitive Discharge Ignition systems. This is a single cylinder 450cc 4 stroke. If you look at the misfire when snapping the throttle you do not see the conventional sloping upwards spark line like you do in a std transistorized system. You can only tell by the higher voltage where the spark line jumps out. Not sure but maybe it would be due to the CDI's "punch thru effect". (normal spark duration I have seen on these systems is about 80 Micro sec)

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Interesting James! I just so happen to be tuning a vehicle on the dyno that has this same style of ignition. This one is MSD and lower rpms and single at high. Doing some testing for some slight high rpm break up.

Looking at your capture was it leaning out or was this after you corrected?

Spence, that capture is with it lean on a snap (acceleration) only. It would stutter and miss a bit. Fixed the problem by adjusting the TPS. It was at .48 volts at idle. Set it at .55 Volts and it ran perfect.

I monitored my A/F and it wasn't that far off the mark. The capture I have was monitoring the ignition primary volts and amps, ignition secondary and WPS watching fuel pressure at the rail.

I was able to pull some timing out to help this setup. Seems to drive through the rpm better but I am still working on it at the time of making this post.

Thanks for posting yours!

By chance did you get a capture of it after you stopped it having the issue?

No, unfortunately time didn't permit.

Interesting, and like everything what does a good one look like?, and 80micro is nothing like standard ignition so this is your own learning curve, what I call empirical studies.

Seems the Pico is working out for James, good for you.


Stitch B