GSX-R 750 Pictures of how I reduced the spark plug wire resistance on my 1985 1986 1987 Suzuki GSX-R750 motorcycle.

I was not getting a very strong spark from my 1986 GSX-R750. I read on that the old GSXR spark plug coils are weak. I read that there is a resistor in the spark plug wire end piece, and it would make the spark that much stronger if I remove the reisitor. Is any of this true? I have no idea. But I decided to do it anyway.

But first, lets pay some bills:

  1. I did an overall checkup of the ignition system. I removed the plugs. I needed a VERY THIN WALLED 18mm socket.

  2. The plugs were fouled on two cylinders. I cleaned the plugs, solvent, wire brush, and fire.
    trial by fire

  3. I tested the spark by grounding the body of the plug to the negative battery terminal, and cranking over the bike in the dark.

    In this picture, the flash clearly illuminates how dark it is.
    dark light

  4. The spark looked ok, really. It was blue, and I think that's good. What do I know about how it should look.

    So, after liberal application of anti-sieze compound, I put the plugs back in using this old rubber spark plug wire piece. I don't want to try to start the plug threads with the socket, because I don't want to risk crossthreading in that soft aluminum head.

  5. And I tightened the plugs just snug, three fingers tight.
    hand tight

  6. The end pieces just unscrew off the spark plug wires. Then I used a screwdriver to unscrew that copper plug on the right in this picture. Behind that is a small grey resistor, a tiny copper disk, and a spring. I thought I would replace the resistor with a piece of copper bar. But that was like three dollars. So maybe a section cut out of a nail would be good, but what a waste of a perfectly good nail. Hot dipped galvanized, no less. Then I had the bright idea to just stretch the spring instead.

  7. Did this help? No idea. Turns out I needed a new coil for the cylinders with the fouled plugs. But it does not appear to have hurt anything.

  8. 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!

  9. Then I finished my beer.

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