GSX-R 750 Pictures of how I cleaned the gunk out of the CDI box on my 1985 1986 1987 Suzuki GSX-R750 motorcycle.

But first, lets pay some bills:

  1. I read on that the circuit board inside the Ignitor (CDI) box was covered in clear goo at the factory to protect it from vibration. And that the goo turns brown and solidifies and becomes conductive with age, and interferes with the proper funcitioning of the CDI. And that cleaning out the goo make motorcycle go more good. I do not know what I am doing, but I am doing it anyway.

  2. There is the Ignitor, or CDI box, on the left side of the bike next to the battery box.
    CDI box

  3. CDI stands for Capacitor Discharge Ignition. The CDI box builds up a charge in a Capacitor. The charge is greater than the alternator's 12 volts, but still less than the 40,000 volts of the secondary coil. The CDI charges to something on the order of 400 volts. The CDI then Discharges the Capacitor to the coil based on the timing from the signal generator, to cause Ignition.

    There is the CDI again. Still next to the battery box. But now it really has meaning, no?

  4. Anyway, I removed the two machine screws that hold on the box, then these two wire connectors.

  5. I popped open the side of the box where the wires go in. A little clip on each side.
    side of CDI box

  6. Then I slid out the circuit board. It was a bit stuck with glue, but big pliers and extreme force did the trick.
    circuit board

  7. There is the circuit board of the CDI with the solidified brown goo on it.

  8. There is the circuit board of the CDI with the solidified brown goo off of it. This only took about an hour and a half of careful picking, scraping, and praying that I did not damage the circuits, which I would have no idea how to repair.
    goo gone

  9. Did this help anything? I don't know. It was a desperation gamble, as I was trying to avoid buying a new coil at the time. See me install the new coil by clicking the Coil link in the menu on the left.

  10. Next I sold out to make 02ยข so I can fulfill my lifelong dream of owning a 1986 944 with blown head gaskets.

    But no minivans!

  11. Then I finished my beer.

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