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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-07-2012, 05:05 AM   #1 (permalink)
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2005 Bonnie speedo

The speedo on my 05 Bonnie is very erratic when doing a steady speed it will fluctuate wildly + and - 20kmh.

Odometer seems to be registering accurately though....Does anyone have any experience of this or have any possible solutions?
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Old 11-07-2012, 05:31 AM   #2 (permalink)
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I had a similar issue on my previous Honda - was caused by loose battery connectors - coming loose and braking connection - lossen them off then tighten with a bit of vasaline on them
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Old 11-07-2012, 06:07 AM   #3 (permalink)
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Check the speedo cable nut hasn't come loose loose behind the speedo. If not it's likely to be a damaged or dry cable.
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Old 11-07-2012, 03:33 PM   #4 (permalink)
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As denbow says most likely a dry cable. Undo bottom fixing and withdraw inner cable clean by pulling through some clean rag the oil lightly with 40 grade oil just enough to give it a film then re-assemble turning the inner so that the square locats into the speedo then fit the bottom end making sure the tongue fits the slot in the speedo drive and re-fit the cross head screw ( Do not overtighten as you can break the plastic also do not over oil the cable as the oil will work its way into the speedo)
T.U.D.
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Old 11-09-2012, 03:48 AM   #5 (permalink)
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Thanks Guys...cable is secure and located correctly,Have removed and lubed with CRC (WD40) and is still erratic.
I will remove again and do as tonupdave says and lube with 40w oil.
Will post results back.
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Old 11-09-2012, 06:38 AM   #6 (permalink)
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These speedos work by a magnet spinning inside an aluminium disc attached to the needle and sprung against the stop by a coiled hairspring......If the cable turns intermitantly you get a jerky reading... The only other cause is the needle sticking or dry of lubricant..One way to test is to remove speedo (A pain!!) and twist it sharply and the needle should swing freely if it don't thats your prob. More of a pain because it needs to be stripped by a specialist ( The rim is rolled on not like old speedos which screw on)
Hopefully the cable oil will do it...Make sure the cable runs in a nice sweep up to the speedo with no sharp bends..I know it sounds obvious.....Good luck..
T.U.D.
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Old 11-09-2012, 09:53 AM   #7 (permalink)
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For what it's worth, somebody was selling a used speedo in the classifieds a short while ago...


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