Question about 1985 Honda CX 500 B

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Not getting fire to the coil.

I think it could be the magneto but I don't know where it is. I am a auto mechanic but this is my first bike. It is a 1981 CX 500. Any advice would be greatly appreciated.

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The magneto is inside the right side case cover.. I think the lutch is on the left side.. You can tell by where the cable goes in. good luck

Posted on Jun 18, 2009


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Looks like you're ruled out the rest except for one thing. The magneto coil. It must be faulty to have caused excessive voltage running through the sparks. The back firing can be caused by poor fuel-air mixture. Set it to 2.5 turns out from full close. and lean out the mixture as necessary. Check for oil as well since low level oil can cause heat problems thus tripping the engine.

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Being that this bike is vintage. You prob have points if not then you have a magneto and coil on the left side you will see wires coming out of the case by where your foot would be. There should be like 6 or 8 phillips head bolts to take case off. Look and inspect and see if maybe you did not tighten the magneto by the flywheel it should be two screws. Try that if the doesnt help. try to jump across the coil from one side to the other see if it fires. If that doesnt help. You may need new cdi box. If theres points I cant help you much never dealt with them much myself sorry. Hope this helps ya.

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