Electronic Speedo problem Help!!!

Discussion in 'Electrical' started by thestu, Feb 20, 2007.

Tags: Add Tags
  1. thestu

    thestu Guest

    Can anyone help???

    Here is the problem:

    I have a electronic speedo that works fine, until I start my motor, then it goes haywire, resets itself and stuff. hit the kill switch, speedo returns to normal????

    I am assuming it is, having an issue with the spark, causing interference. Has anyone has a similar problem, and is there a work around? such as a suppressor, or something I could incorporate somehow???

    Any help would be greatly appreciated


  2. You must have a wireless one. You are right the spark does interfere with the radio signal. Just get one with a wire and it should work fine.
  3. thestu

    thestu Guest

    Speedo help continued

    I should have mentioned that it is a wired electronic speedo. It is the second one I have tried, as I thought there was something wrong with the old one, so i bought a new speedo, but same problem. it is pretty weird.
  4. Some electronic speedos offer an upgrade kit to wireless and the head unit has a reciever in it already. You kick on the engine and it has something to recieve. Sometimes it is cheaper for them to make just one head to do both.
  5. etheric

    etheric Guest

    I put a wireless Trek comp on once and it registered over 100 miles per hour. It was consistent with itself, but of no use to me. Of course then I realized my mistake and replaced it with a wired comp.
    So what company makes your unit? Did you buy the same make/model again?
  6. thestu

    thestu Guest

    Speedo brand

    The first speedo is the brand acme!! no Im not kidding!!!

    The second is a no name manufactured in Taiwan, purchased from Target local department store.

    both work fine, until motor is running.

    I did a bit of an experiment today with the target one, I took it off the bike, to see if it would stuff up, while not connected. it didn't reset itself, but I noticed that it started to work the closer I held it to the cradle. very strange. although it wasn't accurate it worked without resetting. I have no idea what is going on? It is a real pain with no speedo as I am still running the motor in.

    Think I might just go analogue!!!!
  7. dzdaz

    dzdaz Guest


    I just read your post about the probs with wireless speedometers. I broke the sensor on mine a long time ago and got Topeak to send me another one yesterday. Now I read this and find out it probably won't work anyway....oh well at least they were cool enough to replace it for free. Can't beat that with a stick! Maybe there will be some way to get it to work right. Will see!
  8. Blaze

    Blaze Guest

    ** This is copied from a post I wrote in the analog speedometer topic:

    I highly recommend the Bell Spin Fit speedometer. It has lots of functions like odometer, avg speed, max speed, etc. One nice thing is that you can reset the trip odometer without resetting the main odometer. When you replace the battery, you can program in how many miles you already have on your bike, and it will start counting again from there.

    Also, there is a formula you can use to get accurate readings from any size tire. It comes with a list of codes for standard size tires, but if you have an odd size tire, you measure it and do some math, then you enter the final number into the speedometer for the right speed readings.

    Oh yeah, and it's really inexpensive. They have them where I live at Kmart and miscellanious sporting goods stores for about 15-20 dollars.

    I installed the same black and chrome speedometer on all 3 motorized bikes I built and they are reliable and work great.

    http://www.onestopshopcatalog.com/b617n.html (this place is about $22 with shipping to southern California)

  9. gone_fishin

    gone_fishin Guest

  10. thestu

    thestu Guest

    speedo problem solved!!!!

    Hi Thanks for all the advice, but i have good news! I solved the problem!

    went to jaycar (equivalent to radioshack) purchased some ferrite suppression sleeves, slipped them over the speedo sensor wire, started her up and hey presto! speedo works fine! I guess I must have old school copper wire running from the cdi to the spark plug. oh well everything works so I shall try to not ride too close to radios!!!!!

    :grin: :grin: :grin:
  11. srdavo

    srdavo Active Member

    Nov 4, 2006
    Likes Received:
    I have a Schwinn speedo, the $12 one from walmart. it would go blank the moment my engine started, then come back on, but I would have to re-enter my wheel size, on the fly. then it worked fine. so, I just take it off the mount & put it in my pocket till I get it started, then put it back on the mount & it works fine. kind of a pain. glad to know it can be fixed....radio shack here I come!
  12. dzdaz

    dzdaz Guest


    I just went for my first ride trying a Topeak Panoram wireless speedo/computer and it seems to work fine. It's the older version and I had broken the sensor out riding trails a few years ago, recently asked Topeak for a replacement and they sent one pronto, for free. I put it back on my bike which now has a 70cc engine and it worked great.
  13. smitty

    smitty Guest

    Apparently there are two threads about speedometers. I read this one first and tried the ferrite fix, and it worked perfectly. I wrapped the extra wire from the sending unit through the ferrite filter then replaced the zip ties holding the gauge so that they also held the coils in the filter. No more problems. (Man, I like this forum!)
    I tried to post a pic but had trouble.
  14. Speedo's

    My Stewart Warner Whizzer speedo works fine all the time, rain or shine! With or without the engine running, the cable drive works flawlessly.

  15. JemmaUK

    JemmaUK Guest

    Funny that ...

    Wish me luck - I am going to get a cheap bike computer and see if I can get it to run as a rev counter...

    Jemma xx
  16. Sianelle

    Sianelle Guest

    I agree Mike :grin: I use liberated mechanical speedos from dumped exercise machines on my bikes and I've never had a moment's trouble with them.
    You won't catch me putting a computer on my bikes. I saw wot happened in '2001 A Space Odyssey' - you can't trust them computers :shock:
  17. azbill

    azbill Active Member

    Dec 15, 2006
    Likes Received:
    I love that line :lol:
    that's the 2nd time you made me grin with it !!! :lol:

    Sorry for the off topic but I had to say it :)
  18. eltatertoto

    eltatertoto Guest

    that bell speedo is great they dont sell it at kmart or walmart anymore but its younger wireless brother works an my engine bike too...
  19. fetor56

    fetor56 Guest

    I tried 2 Huffy brand puters(1 cord,1cordless) and was constantly plagued with problems of them resetting themselves back to zero(Interfearance from engine noise)
    I know there's a fix for it now,i saw the post on MBc but at that stage i had no idea.
    I then bought a more expensive Echowell brand and it's worked flawlessly ever since.
    Don't buy cheap puters...it doesn't pay.
    Last edited by a moderator: Jan 5, 2008