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Stink Racing

CDI sorted

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2 Comments
by
Skunk
, 24th October 2010 at 20:57 (974 Views)
The CDI issues have been resolved. The Jaycar cheapies work well - when the correct wires are attached.
The stator I was using had the high voltage CDI wires cut off and only the lighting circuit wires left. Novice that I am I used those. Wrong. It works on the RGV CDI as that has it's own step up transformer in the unit so it doesn't need the high voltage charge. In fact the RGV stator only has power that will be rectified. I don't know that.
Anyway, back to the current CDI set up. The stator has three wires; brown, red and black. I've run the black to earth (both chassis, engine and CDI), the brown and red to each CDI for power.

EDIT: the miss has been sorted. You would expect the pickups to fire the coils at the same point as the trigger comes pass wouldn't you? Well, my setup doesn't.
For whatever reason coil one fires as the trigger exits the pickup and coil two fires as the trigger enters the pickup. This means the included angle for the 90° firing is: 135°! Yep, I was wrong to assume I could set #1 at 2mm BTDC and then set #2 90° later. Strangely the RGV has the triggers set at 90° so there must be something else going on in the CDI or loom that I can't see.

Never mind - it's only taken 3 weeks to get the new setup running. I have a very patient wife.

I now need to make a new back plate, flywheel and mounts for the triggers. Anyone got spares?
I also need a replacement RD400 flywheel cover... Yeah, right.

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  1. Expert's Avatar
    If the pulse coil fires as one enters, and one fires as it leaves, you have one of the coils wired back to front. swap the wires on one of the coils, whichever is wrong, and they will both do the same thing. the pulse coils not only create a voltage,. the polarity is important too, and if you have polarity back to front it will do the opposite to what you expect.
    does any of that make any sense?
    i have experience of this and after much head scratching this was the problem, and the solution.
  2. Skunk's Avatar
    Quote Originally Posted by Expert
    If the pulse coil fires as one enters, and one fires as it leaves, you have one of the coils wired back to front. swap the wires on one of the coils, whichever is wrong, and they will both do the same thing. the pulse coils not only create a voltage,. the polarity is important too, and if you have polarity back to front it will do the opposite to what you expect.
    does any of that make any sense?
    i have experience of this and after much head scratching this was the problem, and the solution.
    You are 100% correct. I have fixed that issue. The pickups are now at 90° and it works.