Welcome to Our Community

Wanting to join the rest of our members? Feel free to sign up today.

Sign Up

Speedo sensor- five speed vs six speed

Discussion in 'Vintage Big Dogs' started by BigDogRick, Feb 5, 2018.

  1. BigDogRick

    BigDogRick Active Member
    Supporting Member

    Joined:
    Sep 16, 2012
    Messages:
    550
    Likes Received:
    564
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2008 HD Fatboy
    First Name:
    Rick
    Just finished installing my new transmission sensor (Evo style) on the total rewire of my Vintage Classic which has a six speed Baker upgrade. I found plenty to choose from. At least two stated clearly “ if installing on a six speed, this sensor requires the spacer that comes with the transmission”. So I thought the best gamble for a successful plug and play would be the Dakota Digital sensor. When I removed the old sensor the spacer was maybe 3mm, plastic, dried out and brittle. It broke up so I installed without it. Now it works but reads about exactly double my actual speed. I am assuming it is too close to the teeth. I am thinking I can fab a gasket of several different thicknesses and trial & error it. Any ideas?


    Sent from my iPhone using Tapatalk Pro
     
  2. Brandon Downey

    Brandon Downey Active Member

    Joined:
    Aug 22, 2017
    Messages:
    442
    Likes Received:
    525
    Trophy Points:
    93
    Location:
    Anderson, IN
    My Bike(s):
    2007 Big Dog Mastiff
    First Name:
    Brandon
    Sensors like this typically read via a magnetic field the rate at which those teeth go by (or the rate at which the teeth disrupt the magnetic field depending on the application). Unless these ones work a different way, I wouldn't think a distance of 3mm would double your speed. Probably more of a clearance issue requiring the spacer. I would first try replacing the spacer and see if that does the trick. Surely that won't be too expensive. If that doesn't correct it, hopefully someone with experience with these trannys will jump in.
     
  3. BigDogRick

    BigDogRick Active Member
    Supporting Member

    Joined:
    Sep 16, 2012
    Messages:
    550
    Likes Received:
    564
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2008 HD Fatboy
    First Name:
    Rick
    Agreed. I did actually get a response from Thunderheart regarding the OEM sensor - but that is for the five speed - they still sell it. When I swapped this one out, it is clear it was spliced in as a replacement at the time of my six speed upgrade in 2005.
     
  4. Brandon Downey

    Brandon Downey Active Member

    Joined:
    Aug 22, 2017
    Messages:
    442
    Likes Received:
    525
    Trophy Points:
    93
    Location:
    Anderson, IN
    My Bike(s):
    2007 Big Dog Mastiff
    First Name:
    Brandon
    That's cool that Thunderheart got back with you. Keep us posted on the repair, very interested to see what fixes your problem.
     
  5. BigDogRick

    BigDogRick Active Member
    Supporting Member

    Joined:
    Sep 16, 2012
    Messages:
    550
    Likes Received:
    564
    Trophy Points:
    93
    Location:
    Phoenix, AZ
    My Bike(s):
    2000 Big Dog Vintage Classic, 2008 HD Fatboy
    First Name:
    Rick
    Just finished a lengthy email exchange with Keith at Thunderheart (they go by Thunder Max now). There is a programmable sensor for six speed Evo style V-Twins that should fit my bike. Here is the one they recommend.
    https://www.thunder-heart.com/shopexd.asp?id=294&bc=no

    Good for 95 to 03 bikes Harley type V twins. It must be matched up with the VDO stock speedo
     

Share This Page