Thanks for that idea. Copper's good (excellent for RFI) but steel's about twice as effective for anything magnetic. Anything conductive will work, given enough thickness, but anything magnetically permeable works best. Which is why I've fixated on steel, difficult as it is...
The idea I've been toying with is to machine up a Y-branch housing (steel) and a bunch of fish spine beads (also steel) and then find a way to connect them mechanically and electrically, then shield the lot against the weather. It's big work and at the moment I can't think of a way to guarantee longetivity.
The alternative (as you suggest) is piping, in that case copper would be a hell of a lot easier to play with as a first try. Certainly 1mm-ish wall thickness copper would be a big step up from the braided shielding. It's also much more likely to age well... One piece construction, can be covered in heatshrink, the ground lead will solder to it without issues... it's got a lot going for it. Well worth a try as a first cut, if this does the trick then there's no need to spend weeks making beads by hand. Thanks again Pete.
The other path to take is separation - get the CDI's and pickup leads as far away from the coils as possible. That option's still open but having heard the motor finally synchronise sort of properly (with the earlier attempt at shielding) I'm curious; can it be done?
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