coil over plug idea...

[olie05]

My motivation for doing this was to have a water tight system that would run well in rainy conditions. The stock setup was not meeting my expectations.

[buzzawak]

Thanks for the reply olie05,
I got hold of the CBR manual and it describes the ignition system as "Full Transistorized Ignition".
Under the testing section it then specified to test the primary side of each coil for a 100V peak voltage.
Please anyone chime in and correct me but this sounds like some type of CDI system to me.

[DonTZ125]

CDI usually runs 250-400vdc. This is definitely a TCI system they're talking about; that's the "flyback" voltage created when the magnetic field collapses in the transformer core. Very sharp collapse of an inductive field = steep voltage rise, well above nominal feed voltage.

How do they suggest this be measured? I wouldn't have thought anything other than an oscilloscope would be capable of registering such a fast pulse.

[buzzawak]

CDI usually runs 250-400vdc. This is definitely a TCI system they're talking about; that's the "flyback" voltage created when the magnetic field collapses in the transformer core. Very sharp collapse of an inductive field = steep voltage rise, well above nominal feed voltage.

How do they suggest this be measured? I wouldn't have thought anything other than an oscilloscope would be capable of registering such a fast pulse.

Using a peak voltage tester or a peak voltage adapter (Honda tool) with multimeter.

[turbofly]

Hi all,

Just thought I'd give you guys an update as to my experience with this mod. I picked up the cbr coils on ebay and wired them up as per olie's diagram, and it worked flawlessly for the 2012 riding season. Thanks again olie.

I had been hoping that the updated coil system would solve my problems with hard cold starting, quickly fouling plugs, and a lack of power. It did not. I guess a lot of you have figured out what the true issue was. I knew too and didn't want to admit it. My bike had almost 50,000 km on it. Judging by the inability to fit feeler gauges between almost half of the cam lobes and corresponding lifters, I decided it was time for a valve adjustment. I know this is recommended every 25,000 km, and I don't think it was ever done before. Anyway it worked out good. I got to buy new tools, spend some time in my garage, now the bike runs substantially better than when I picked it up near the end of 2011.

As for the new coils, I can say that they definitely do what olie was hoping to achieve. I got caught in a rain storm last year and my ignition never let me down.

[pefrey]

Wow that's a heck of a follow up. I'm wondering how much weight this conversion saves. Personally my stuff aint broke some I'm not going to try to fix it if you know what I mean, although this is a pretty cool project.