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Thread: Tach needle rest problem. Gauge needle for tach rests about 5k counter-clockwise!

  1. #1
    Baby Twin
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    Tach needle rest problem. Gauge needle for tach rests about 5k counter-clockwise!

    I've searched the Internet a bit and nobody seems to have an answer for this one.

    When my starter relay began failing last week, the tach needle jumped all over the place so much that now it rests up at 12k. It seems to rev normally but is 5k to the left of where it should be. So when I rev to about 6k, it shows 1k on the rpm guage.

    Does anyone know of a way to fix this without opening the gauge cluster? I replaced the starter relay tonight with the Yamaha starter relay I bought on eBay for $24 delivered. But it is not good to have the needle pointing to the wrong rpm all the time. If I have to take it to the dealer to fix it, it will be quite a while from now since we're just not rich. Hahaha.

    Any help is greatly appreciated!

    Thanks,
    Dave

  2. #2
    Baby Twin
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    Yep - I'm a newb. Can't figure out how to edit my post to say my bike is 2004 Aprilia Tuono. Thanks!

  3. #3
    WSB Pit boss Aldo's Avatar
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    Welcome Dp, It sounds like the needle has spun on the spindle

    I'm sure someone will find a fix for you.

    There's an edit box for altering your posts but it's only there for a short time after you post.

  4. #4
    GP Champ Batfastard's Avatar
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    Tifa is the resident Clocks expert.

    I think you probably need to pull the dash apart and re set the needle.

  5. #5
    AMA Pit Boss rico's Avatar
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    If the needle swing tae the left from 12k doon tae 6k when runnin ie soonds like its workin backwards.

    Mibbe a polarity issue wi the rewired stuff? Nae idea really wiz jist a random thought

  6. #6
    Baby Twin
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    Thanks - any best way to take the dash apart?

    Thanks for the help so far. The needle does seem to just be seated on the spindle in the wrong position. It really flipped around a lot when the starter relay was failing.

    So... Is there any best way to take the dash apart? My brother said to hit it with a hammer so I guess now I know what happened to the dash on my last bike.

    Thanks,
    Dave

  7. #7
    WSB Pit boss Aldo's Avatar
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    I've got a similar bro.
    His tool box has only two items in it, guess whit they are.

    Ooops sorry, make that three.

  8. #8
    Baby Twin
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    Did anyone find a fix for this? I'm having the same issue

    Sent from my A0001 using Tapatalk

  9. #9
    One Litre Duc Eater Paul D's Avatar
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    You could try using a fairly strong magnet. Put a tissue under it so as not to scratch the display lens. Then rotate magnet anticlockwise and see/hope it might rotate the needle mechanism.

    When I last removed my clocks I noticed the rev counter needle moved freely... so assumed it would find it's reference position once energised (i.e. ignition turned on). I left the needle in the approx correct location, hence didn't test this hypothesis.

    However, accessing clocks isn't particularly hard, and is required to replace bulbs anyway.

    Process is:
    1) Remove fairing (4 allen key head bolts) and disconnect headlight connector.
    2) Remove 3 10mm (plus washers) nuts on back of clocks.
    - You probably may also need to remove plastic tray above wiring loom (via 4 Allen key bolts), to access white connector on back of clocks.
    3) Remove shroud around white connector, push tab in and pull white connector off clocks.

    4) Clocks then lift up and off bike.

    5) Take clocks into a clean environment, like 'kitchen table' (wife permitting) or office.
    6) Using small cross head screwdriver, remove 8 (approx) screws in back of clock unit.
    7) Gently lift back cover off clocks and also gasket (which re-locate on lugs).
    8) Internal PCB clock module then lifts out of the front casing.
    9) You can then wind the rev counter to desired position with your finger. As said, it turns freely.

    Re-assembly is simply the reverse of the above.
    Be careful tightening screws into the plastic housing. I squeeze the housing together with one hand to compress the gasket, then nip screws to biting point and no more. otherwise you will strip thread out of the plastic securing lugs.

  10. #10
    WSB Pit boss Aldo's Avatar
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    P, don't remember it anything like that mucker.

    I did the Gore-Tex patch fix to stop my clocks fogging.

    Sorry mucker just noticed it's a gen1.

  11. #11
    Baby Twin
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    I'm going to take the dash apart to finally fix the tach needle so I might as well upgrade the headlights. What size are they and anyone have any recommendations for brighter ones? What's the consensus on LEDs? And my housing is starting to rust, and way to treat it and clean it or should I replace after it gets pretty bad?

    Sent from my A0001 using Tapatalk

  12. #12
    One Litre Duc Eater Paul D's Avatar
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    Housing isn't rusting as it's made of plastic! . But they go brown (usually below the bulbs) due to heat of the bulbs. Happens on many of the Tuoldos. You could try to paint it using a fine brush thorough the bulb opening, but could be tricky!

    Gen 1 bulbs are H4 if I recall. Some info here on brighter bulbs: http://tuonozone.com/aprilia-tuono-v...ight-bulb.html

    I changed my 5W5 pilot light bulb for a 5W5 CREA, 6,000k replacement, which is about 2W but many times brighter, which helps get you noticed when riding, unlike the pointless original.
    Thanks from CamoKing88

  13. #13
    Baby Twin
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    Awesome, thanks for all the info. I'll have to report back with what I do and send pics on how it all turns out.

    Sent from my A0001 using Tapatalk

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