1975 CB500T with Electronic Ignition
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  1. #1
    Junior Member RichieYZF's Avatar
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    1975 CB500T with Electronic Ignition

    I'm looking for a bit of advice.

    I have fitted a Charlies Place Electronic Ignition to my CB500T, but when i check the timing on the LH side, the light comes on when the LF mark is approx 180 degress from where it should be.

    I have tried following the instructions but i'am now confused as instructions are for a CB450 aswell

    One thing i noticed is that my Advancer plate has writing on both sides, so i'am unsure which way the advancer plate should be fitted, and which way the magnet needs to go.

    I have also fitted a set of Dynocoils and Mikuni carbs.

    Any help would be much appreciated

  2. #2
    Super Moderator ancientdad's Avatar
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    I'm not familiar with Charlie's Place ignition - does it use the stock advancer? If so, from the pictures I see at their website it looks like the replacement for the breaker cam goes on the OEM advance unit and could go on 180° out much like the stock one for points, which would put your timing way off. Pictures of your situation would probably help too
    Tom

    CL450 project reboot, street legal this time
    Budget drag bike project
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    running points... because I'm too old for mysteries that begin with pushing

  3. #3
    Junior Member RichieYZF's Avatar
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    Yes it uses the stock advancer, but im not sure that the advancer is the correct way round.

    I will upload some photos when i can.

    because of the way the charlies plate has been machine, i think it can only go one the way around, thats why i was questioning the orientation of the stock advancer plate.

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  5. #4
    Senior Member jays100's Avatar
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    The advance mechanism has alignment marks so the cam and base plate are assembled properly, they're very visible if you look closely.
    If you do a search in the 450's section, i don't remember if it's in the engine or electrical section, there is a nice comparison of the advancers used and their various alignment marks.
    I'll post a link if I can find it.

  6. #5
    Senior Member jays100's Avatar
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  7. #6
    Junior Member RichieYZF's Avatar
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    I checked the advancer plate fitted to my bike, and it has CB450 stamped into it.
    Is this the correct one for the CB500T
    Attached Thumbnails Attached Thumbnails 1975 CB500T with Electronic Ignition-33726d93-2ba7-41c7-bbd8-4f6576717558_1529961764880.jpg   1975 CB500T with Electronic Ignition-167e4966-4a13-425f-bdb0-a6e214f689ed_1529961790884.jpg  

  8. #7
    Senior Member 76TWIN's Avatar
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    That does look to be an advancer from a CB450 as mine does not look like that

    This is what mine looks like



    Regardless though the CB450 advancer should work anyway. Try flipping it.
    '76 CB500T Frankenbike
    '73 CL450 (basket case for now)


    Carpe narem.

  9. #8
    Super Moderator ancientdad's Avatar
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    ^^^and maybe get the proper size flat washer for the rotor (or whatever they call the piece for the electronics that goes on the advancer) so it doesn't come out over the bolt head. It should look like this (note the black, full-sized washer behind the bolt head so the OEM breaker cam does not come off the center post)

    Contact Breaker Point Gap and ignition Timing Adjustment

    and I also found this, just FYI... I didn't know there was a difference but it makes sense

    https://www.hondatwins.net/forums/57...tml#post274753
    Tom

    CL450 project reboot, street legal this time
    Budget drag bike project
    CB350K1 full patina project
    Ride along at the drag strip


    running points... because I'm too old for mysteries that begin with pushing

  10. #9
    Junior Member RichieYZF's Avatar
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    Cheers for the info

    Will look into getting the washer to hold the rotor on.

    Spoke to Charlie's Place, they were really helpful, and have offered to send a different rotor that should work with the advancer plate that i have

  11. #10
    Junior Member RichieYZF's Avatar
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    Does anyone know if a standard washer can be used to hold the rotor onto the shaft, or does it need to be a certain material??

    Just wondering as its right next to the rotor magnet, pick up coils etc..

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