GV125Ç Speedo fault
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Hello wonder if anyone can point me in the right direction?
Riding home the other night my speedo decided to give up the ghost.
It was chucking down with rain when I suddenly went from 30 mph to the top of the clock then random speeds or absolutely nothing. Today even in the dry started out with random speeds then nothing. On my way home nothing except the occasional flick of life. Also not recording milage.
I think it might be a damaged wire but dark by the time I got into can’t see anything, or could it be the dynamo in the hub that generates charge that is converted to speed an distance
Any help gratefully received
Regards to all
Nigel
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Hello,
If your LEFT FORK at the bottom has a digital sensor attached to the wheel spindle,
Take it off;- Inspect the wires for water including plug end that connects to the dash harness.
- Add some thick grease on the actual speedo drive unit, the factory grease tends to wash away in rain.
- Test run and see if that helps
- Your dash will have a “digital” LCD display bang in the middle of RPM & MPH counters . The LCD unit counts the fuel level digital
This is for GV’s that are of a later model (which i assume you have)
If the left fork has a MECHANICAL speedo driver which a cable that hooks “directly” under the MPH counter of the dash (not electric)
- Take the cable off and inspect it. The cable is more likely to fail than the actual manual speedo drive unit
- As before with the digital comments above, inspect the mechanical unit and grease it well.
- Your dash will have a “Manual Fuel Level Gauge” for older GV with mechanical speedo drive as a hint.
Lets see if that helps ?
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Just a short update on my speedo problems. I did all the removal and clean up and rebuilt using good old lithium grease. All went back together OK and went for a test ride. Part way along the road speedo lept to the top of the clock and imediately zeroed never to work again. Sadly a combination of house moves that never happened and winter got in the way. Poor bike got layed up and a mighty search began for the wheel rotor, ending with a global ebay search which showed only 1 preowned for the same model year from Leicester. Shortly after in January I did move house but the weather gods had their fun and things stood still. I managed to source a complete set of brand new clocks from Korea. Just last weekend did a full service and oil change, took the speedo off the new set and fitted it onto the old kit, and nothing happened. After much swearing I removed the complete set of clocks put the new speedo back onto the new set, wired it all up fired up the engine and ran it around my yard, presto speedo back in action. It seems that the fuel guage/mileometer is also a computer that converts the analogue signal from the rotor to a charge that operates the speedo. That was the part that failed. Only issue I have is my bike only reads 14 miles on the clock and just a tad over 6000 on the defunct set. Phototaken for mr MOT man to show milage on the old set
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Hey,
Sorry about the post not appearing, i had to manually approve it (it wasn’t even spam!). I’ve now seen the reply and will like to congratulate you on the eventual house move , hope you have settled in now despite the weather being a YoYo, typical britain, so i share your frustrations.On to bikes now, it is rare for a GV display to fail reading the MPH counters. The manual dials on the left and also the central fuel gauge the digital version can both read and collect mileage. I would have only just replace the wheel sensor that’s on the fork , a new one ideally as used ones are hit and miss unless seller guarantees it works.
I am glad you managed to fix it. Please don’t bin the old cluster away , if it is no use to you, just send us a DM and i may consider purchasing it from you if we ever do another GV project restoration. Or keep in your shed for future backup, though it rarely fails.
The MOT guy may not bat an eye lid but well done for recording old and new mileage , even for your future records 👍
I hope i made sense and I have understood your replies properly , correct me if im wrong about anything you said.
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