Question about 1970 Honda CB 100

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I've replace evrything on this bike, points, stator, wiring harness, coil & ignition switch, still no spark. ny ideas?

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You need to check for 12 volts on the coil with the switch on. If the points are open the coil should have 12 volts on both sides, if the points are closed you should only have voltage on the coil positive side. recheck all wiring from the coil to the points/condenser plate, check the wire at the points connection should be hot with the switch on and the points open. The point plate should be grounded. Check for any oil or grease in between the points contacts, the contacts have to be dry. Last check for the rotor shaft to be turning, as you turn the engine the rotor shaft should turn with the engine to open and close the points. recheck your gap and be sure the plate does not move up/down.

Posted on Aug 28, 2010

Testimonial: "Thanks, I'll check the plate for ground and voltage."

  • bikerestore Aug 28, 2010

    How do I check the plate for gound? is there a wire behind it?

  • John Fourteen Six Aug 29, 2010

    No wire, it is mounted with screws to the engine, check that these screws are tight. A quick way to check the plate for ground is with a good old school 12 volt test light. Hook the clip end to the Negative post on the battery and touch the pick end to the plate and then to the points where the screw to the plate the test light should light up. That means you got ground. You can also us a good volt / ohm test meter, on the ohms setting touch the red lead to the engine block and then the black lead to the points plate you should get a 0.000 reading. You can also read for voltage on the DC voltage scale, turn the switch on and hook the black lead to the engine block then touch the red lead to the points plate if you get a reading of, 11 to 12 volts your plate is not grounded and the engine will not start.

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