An ideal bit of kit to use is a mini wire brush - you can get them in crafty type shops or anywhere that sells Dremels / Wizards. It's just a tiny wire mop that goes in a drill / Dremel.

I have a few spare - you can have one for zip if you want, I get through about 3 Dremels a year and they always come with a load of useless extras and some useful ones such as the wire mop.

Not wanting to make anything of it but I am pretty sure there's a minimum CDi pickup gap - if it get's too wide then the timing drifts out and the load on the CDi goes up. If it's not in any Honda manual it will be a generally accepted figure. I'll look it out for you later on today.
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These aren't the droids you're looking for.