speedometer drive help

Discussion in 'Sportster Models' started by gobblerljw, Jul 13, 2010.

  1. gobblerljw

    gobblerljw Member

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    ok I have an 82 XLH I changed the speedo head because the OEM one quit now it reads wrong but not off like if it was a 2-1 drive and 1-1 head if it reads 50 its really 45 but when you get to 100 you are doing 80 so it increases diff the faster you go the only thing I can find on the drive is NS any help would be great THANKS
     
  2. Breeze3at

    Breeze3at Well-Known Member

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    Is the front tire exactly the size and brand of the OEM, and with plenty of tread? The percentage variance is kinda puzzling.
     
  3. Jonas

    Jonas Junior Member

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    I was thinking the same thing. Maybe the speedo he bought is for a different bike with different stock tire size. Were did the purchased speedo come from?
     
  4. gobblerljw

    gobblerljw Member

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    I got the gauge from a harley shop in Salt lake and yea the tire is the same size and almost new and thats why I am puzzled about the diff in speed cause its not consistant with a 2-1 or 1-1 ratio and I dont want to buy another drive and have it go a diff way so I guess I will pull it off and see what I find oh and I was using my GPS to check speed thanks guys for your thoughts and help