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TCI Replacement 2020 It Works

Discussion in 'The Garage' started by Team Junk, May 15, 2020.

  1. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Said I made a Bell Punch yesterday. Never said that's all I made. :sneaky:


    PXL_20210428_145624319.jpg


    PXL_20210428_145715256.jpg
     
    Signal, gggGary, GLJ and 1 other person like this.
  2. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    The Gonzo box itself draws so little power I'm having trouble measuring it. I have one that has been cut open and one thing that was exposed was the power input filtering. This box was designed for a electrical noisy environment

    The only signal that would likely interfered with is the pickup leads which are a balanced circuit that by nature noise canceling. The original TCI system was designed when Hall effect pickups were not common. Hitachi used a magnet and pickup coil which operates at a much higher voltage level which minimizes the effect on the signal. On my test bench the pickup wiring is very close to the spark plug wires and I see no noise on the oscilloscope traces and on Jim's traces also.


    That's what I doing here by asking for feedback
     
    gggGary and Jim like this.
  3. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    That sure is pretty and pretty much what I envisioned.
    What is the what appears to be a phenolic block with the 3 screws?

    Looking forward to you getting it spinning and I'am hopeful that the pickup will see the steel screw going by.
     
    gggGary and Jim like this.
  4. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    If it was a concern, running a twisted pair from the pickup (such as my pic above) is a tried and true method of noise reduction. I have a new GN250 pickup. Suzuki did not see fit to run a twisted pair off it. Don't think it's much of a concern.
     
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  5. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    What did the gn250 pickup ohm out at ?
     
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  6. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Phenolic block is the connection point for the pickup. Gonna do the same to the SG... hard wire from GN box to motor.... and quick disconnect at the stator. That way you don't have to disassemble half the damn bike to replace the pickup.
     
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  7. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    225Ω. The mount bracket is molded into the pickup. If it weren't for that it might be viable. Still ponderin' :umm:

    PXL_20210428_152534979.jpg
     
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  8. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    Things are looking up in the Gonzo world.

    BTW Jim
    Heads up. A upper level low is approaching from the west and all hell is supposed to break out tonight here. From previous experience should be knocking on your door Saturday or so .
     
    gggGary, nj1639 and Jim like this.
  9. jetmechmarty

    jetmechmarty What should I put here? XS650.com Supporter Top Contributor

    Speaking for myself, I have a late model running TCI and I intend to have two, at least. My current desire is the have a module as a spare (I really don't even know what module to buy where) and the harness adapter to plug it in. I just haven't reached the process of doing it.
     
    Team Junk, gggGary, Jim and 1 other person like this.
  10. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Good plan Marty. I'm doing the opposite right now.... running the GN box through the pigtail as the primary, with the original TCI still installed as the backup. About all you'll also need to do is slot your TCI pickup. Timings slightly different between boxes and will prolly need adjusting when switching from one to the other.
     
    Team Junk, gggGary and jetmechmarty like this.
  11. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Just had a thought.... Drill 2 small 1/16" holes in the TCI pickup mount tab... one on each side. Now, check and adjust timing as required to make sure the TCI is set right. Then, drill through one of those holes into the stator just enough to make a (dimple) reference mark.
    Next... hook the GN box up and repeat.... adjust timing and drill the reference mark for that in the other hole.
    Now.... you can swap boxes on the side of the road without needing a timing light.... just slide the pickup as required to align the respective reference mark.... start your bike and press on.
     
    Rasputin, Team Junk, Signal and 2 others like this.
  12. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    I'm reposting this from a different thread because of the ongoing discussion of advance curves.

    http://www.xs650.com/threads/gonzo-diy-tci-system.57694/

    Here is the readers digest version. The first post has the estimated advance curve which has pretty much what we are seeing in the meat world. The advance chart comes from @TwoManyXS1Bs who recommended the 35 degree total advance. The fuel we buy today is whole different fuel than what was available in 1967 when the xs650 was being designed. I have looked at the advance curves of a lot of bikes in the last couple of years and the Gonzo is right there in total advance on modern bikes of similar tuning. The lochin 300 that the Gonzo was designed for is a pretty good match in tuning and cylinder capacity. I think that a few degrees less advance is a nice safety margin considering todays fuels and in my case 100+ degree summer days in my part of the world.
    The other thing to consider is the difference in total advance is probably in the same range as the slop in the steampunk advance unit and cam chain slop on the stock points system.
     
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  13. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    :laughing:
     
    gggGary likes this.
  14. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    Oddly enough flyweight governors date back to the victorian age of steam.
     
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  15. GLJ

    GLJ Never go faster than your guardian angle can fly. Top Contributor

    Even longer than that. Think wind mills.
     
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  16. Jim

    Jim Beyond the edge is the unknown. Here be Dragons XS650.com Supporter Top Contributor

    Christiaan Huygens is credited with flyweights back in the 1600's.
     
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  17. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    I've always associated them with steam engines but it doesn't surprise me that they date back that far.
     
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  18. GLJ

    GLJ Never go faster than your guardian angle can fly. Top Contributor

    He was Dutch. The Dutch didn't invent windmills but they did use them a lot.
     
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  19. GLJ

    GLJ Never go faster than your guardian angle can fly. Top Contributor

    Quick question does anybody know what time of the week caused most of the damage to windmills in Holland that caused them to disappear?
     
    gggGary likes this.
  20. Team Junk

    Team Junk XS650 Guru XS650.com Supporter Top Contributor

    [​IMG]

    I'm thinking a gofundme to get you a clear alternator cover. That's too pretty to cover it. The phenolic is so retro cool.
     
    Jim and gggGary like this.

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