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Thread: Speedo over reading

  1. #1
    Join Date
    Jul 2016
    Gold Coast

    Speedo over reading

    Hi All,

    As part of sussing out teething problems with my recently finished S2a wide light project, I noticed that the speed over reads by quite a bit, like 10-15%. It's a 1408 TPM unit and I'm running 7.50 x 16 tyres, which I thought was the correct combination.

    Are the speedo's adjustable ? If so, any clues on that ??


  2. #2
    p38arover's Avatar
    p38arover is offline Major Part of the Heart and Soul of AULRO Gold Subscriber
    Join Date
    Jan 1970
    Western Sydney
    I assume you mean it reads high.

    Most speedos do and, now, are not allowed to read low.

    Our last three Foresters have read beiween 8-10% high.

    My 2007 Yamaha reads 110 at 100, 100 at 90, etc.
    Ron B.

    2004 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA

    RIP Bucko - Riding on Forever

  3. #3
    Join Date
    Jan 1970
    Central West NSW
    The only adjustment is the position of the pointer. With the glass and case removed, you will find that the stop for the needle can be pushed down (its a spring) to allow the needle to move back beyond it. It should point to a tiny white dot on the face. Its position can be moved by carefully twisting it while holding the alloy plate that is pulled round by the magnet (careful not to bend anything). Then depress the stop and put the needle back on the right side of the stop.

    The other possibility is that there is some dirt (or magnetic fragment) between the magnet and the disc, but I would expect that if that were the case, the reading would be very erratic.

    Hope this helps

    1986 110 County 3.9 diesel
    1970 2a 109 2.25 petrol

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