Ignition switch replacement

Discussion in 'Honda CT70/Z50 Registry' started by Casey Neiman, Mar 6, 2020.

  1. Casey Neiman

    Casey Neiman New Member

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    My CT 70H had a broken ignition switch and I can't find a replacement. The original has a triangular shaped end on it. All I can find have square ends and won't work. Any suggestions?
     
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  3. racerx

    racerx Administrator
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  4. allenp42

    allenp42 Well-Known Member

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    I haven't seen a NOS triangle shaped switch in a while. I used the square one once and did not have any issues. It mounted just fine and worked as expected. To be honest, not sure of the difference between what's available new vs. the NOS switches listed on e-Bay?

    Most of the new ones have a "T" shaped key as well.

    I may have one, but it will be tomorrow before I can lay my hands on it.

    Pretty sure I used this one.
    https://www.partzilla.com/product/honda/35100-098-672?ref=bb8db80bb202954aabfd5580f7e710ad77952646
     
  5. Casey Neiman

    Casey Neiman New Member

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    That is the first one I had. The switch doesn’t provide power to the headlight and dash lights in the second position (brown/red wire)
    Thanks for your answer. It is appreciated
     
  6. allenp42

    allenp42 Well-Known Member

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    This is strange. I'm assuming the new switch has a blue wire? It almost sounds as if you received a defective switch. I checked a new one once and saw no difference (electrically) between it and the triangle version. However, it was 3-4 years ago when I fixed up my first CT70 (HK0).
     
  7. kirrbby

    kirrbby Well-Known Member

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    Casey, are you sure that is the part number that you ordered??

    The new switches ALL have a square back plate. But if you bought the correct switch for a HK0, it should have the blue wire that Allen mentioned, and it should work.

    But, that is assuming that your bike has the correct K0/HK0 wire harness also. And, assuming nothing has been altered over the past 50 years.

    The K1/HK1 harness and switch is different.

    Maybe the brown/red wire has a break, or bad connection, somewhere between the switch and HL?
     
  8. Casey Neiman

    Casey Neiman New Member

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    Hello everyone and many thanks for your help on my ignition and spark problems on the 70. I got it all put together and figured the switch out. All the lights work now as they should. I found a bad ground on the tail light mount and eliminated some rust accumulation on the little strap that grounds the bulb holder to the chassis.
    The spark was due to good old bass-ackward-ness, as in cam sprocket 180 out. Then I adjusted the valves and she fired up.
    It starts like a champ now but I have low power and it backfires so I figure it is the point gap and I have found similar issues on here so I will give it a try, also need to adjust the valves again.
    Thanks again for your help, will probably be back!!!
     
  9. racerx

    racerx Administrator
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    Reinstalling the point cam "reversed" is beyond easy to do. Consider it for what it is...a rite of passage for the serious CT70 enthusiast, one of many scheduled stops on the road to "expert".;)
     
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