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Speedo.

Discussion in 'Wanted' started by ninja, Aug 8, 2019.

  1. ninja

    ninja

    Joined:
    Oct 10, 2017
    Looking for a Green blobb speedo for my 72 Commando Can swap an NVT
     
  2. Danno

    Danno

    Joined:
    Feb 7, 2010
    If you don't find one, you can have the NVT version re-faced with the Green Globe type.
     
  3. ninja

    ninja

    Joined:
    Oct 10, 2017
    Cheers, I was considering going down that route.
     
  4. o0norton0o

    o0norton0o VIP MEMBER

    Joined:
    Apr 27, 2015
    That's what I did. I was having trouble with my original speedo. I bought a similar one off ebay to canibalize for parts. The parts speedo worked, so I just swapped out the face plates. I should repair the original,... I actually bought the repair book for magnetic instruments to be able to trouble shoot my instruments. I lent it out to someone and they have yet to do their repair either... These instruments are not simple to repair... I got lucky with my ebay purchase which spared me from extensive google searching and buying replacement parts for hit and miss surgery.
     
  5. ninja

    ninja

    Joined:
    Oct 10, 2017
    Thanks for that, I suspect I will send my speedo away to one of the specialists as the ring around the face is a bugger.
     
  6. o0norton0o

    o0norton0o VIP MEMBER

    Joined:
    Apr 27, 2015
    Actually replacing the ring is simple. The internal mechanism is beyond imagination, and how it was engineered to be accurate is unfathomable. The cable spins a magnet that is suspended below a disk of aluminum which has a very fine watch spring mechanism attached to it. Did you know that aluminum is "slightly magnetic"??? so the spinning magnet induces a small amount of rotation in the aluminum disk, which is balanced against the spring mechanism to which the instrument's pointer is attached. The guy who developed this should be given a medal (because it can work pretty well) and put away in a mental facility because only a crazy person could invent such a thing....

    I can't see "fixing" the watch spring mechanism. I think you just replace the whole thing if it's suspect. The rest of the repairs seemed to be inspecting parts for wear, and cleaning to restore the moving parts to their original state so the magical balance of magnetism and watch spring resistance is restored...
     
  7. Craig

    Craig VIP MEMBER

    Joined:
    Dec 20, 2005
    Have paid to have both clocks rebuilt over the years , when I want accurate I put iPhone on handlebar and use speedbox ....
     
    lazyeye6 likes this.
  8. utahprof

    utahprof

    Joined:
    Feb 4, 2012
    Ninja,

    I have one of the green blob speedos from a now-gone '72 roadster that might work for you. The glass face is cracked so you would probably want to replace that, and the chrome trim ring is scuffed on the left edge. The speedo is still in the mounting cup so would come with that in place. Also have the green blob tachometer from the same bike available. PM me for details and/or photos, and if interested let me know where you are located so I can have some sense of what shipping cost might be.
    Rick
     
    Craig likes this.
  9. ninja

    ninja

    Joined:
    Oct 10, 2017
     
  10. ninja

    ninja

    Joined:
    Oct 10, 2017
    Hi yes would certainly be interested, I'm in Pershore nr Worcester.
     
  11. ninja

    ninja

    Joined:
    Oct 10, 2017
  12. utahprof

    utahprof

    Joined:
    Feb 4, 2012
    Photos sent to your email address.
     
  13. ninja

    ninja

    Joined:
    Oct 10, 2017
    Thanks buddy.
     
  14. NickZ

    NickZ VIP MEMBER

    Joined:
    Oct 31, 2018
    If you still have the green blob tach, I am interested.
     
  15. ninja

    ninja

    Joined:
    Oct 10, 2017
    ) hi I haven't got a Green blob speedo, but I am looking for a Green Globe, problem is Utaprof has one but shipping costs to UK are silly money so will try and find one closer to home. Cheers
     
  16. utahprof

    utahprof

    Joined:
    Feb 4, 2012
    NickZ,

    When Ninja was inquiring about my speedo a few weeks ago he also had some interest in the tach, at least until we learned that shipping/import tax costs to the UK were so costly. To make sure things worked properly before finalizing a deal I hooked both the speedo and tach up to my on-the-road Commando, and learned that while the speedometer was operational the tach was not -- the needle would just jiggle a bit with revs but would not move up the dial. So, while I do still have the tach, it is not operational and would likely need to be sent in for a rebuild.

    I do still have the speedometer, which is operational, and was thinking of trying to swap out the trim ring and glass from the tach to the speedometer but haven't given that a try yet... maybe if someone ends up wanting the speedometer at some point I'll try to go that direction.

    Rick
     
  17. NickZ

    NickZ VIP MEMBER

    Joined:
    Oct 31, 2018
    Rick, Thanks for getting back to me. I have been traveling so I wasn't able to get right back to you. I understand the situation and your plan going forward. My speedo is the green globe (not blob - dang spell checker), but the tach on this bike is the later type with the curvy arrows. I'd like to match with the speedo.
    I'll keep looking.
     

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