Miles not clocking up!

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kinga
Posts: 172
Joined: 5th January 2014 - 1:03pm

Miles not clocking up!

Post by kinga » 23rd July 2020 - 11:56pm

Hi all,
Went out in my 68 fasty today and noticed that the speedo is working fine, but the miles aren't moving, on both the odometer and the trip recorder.
Any suggestions?
Is there an easy fix worth trying, or is it speedo out & repaired/refurbed/replaced?
Is the speedo out an easy job?
Thx

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broady_6
Posts: 2618
Joined: 13th January 2009 - 8:55pm

Re: Miles not clocking up!

Post by broady_6 » 24th July 2020 - 8:14am

speedo out, the small nylon drive gear will have failed unfortunately. to get it out it fairly easy, unscrew the cable, disconnect the light wires and then on either side is a metal tang. push the gauge back and squeeze these tangs in. then draw the gauge out forwards. depending on how big you hards are it can be a bit tricky.
The sultan of swing

kinga
Posts: 172
Joined: 5th January 2014 - 1:03pm

Re: Miles not clocking up!

Post by kinga » 24th July 2020 - 8:25am

Thanks Broady. So do I need to replace the whole speedo, or can I just change the nylon drive gear, if I can get one!
Tnx.

kinga
Posts: 172
Joined: 5th January 2014 - 1:03pm

Re: Miles not clocking up!

Post by kinga » 24th July 2020 - 5:37pm

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Hope the pictures work!

The metal cogs all move fine, so which nylon bit has failed?

Is it serviceable, or whole new speedo?

Also, how does the trip button come off so I can get it all apart? Looks like there should be a small grub screw in the knob but mine is missing. Tried pulling it and turning it, bit it hasn't moved..didn't want to give it too much grief in case I break it!

Tnx

kinga
Posts: 172
Joined: 5th January 2014 - 1:03pm

Re: Miles not clocking up!

Post by kinga » 24th July 2020 - 6:50pm

Ok, just had another look..it looks like drive has been lost between the metal gear that turns the spindle with the main digits on it and the grey nylon gear at the far end of the spindle..hopefully you can see, just by the number 7 at the back on this photo..
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kinga
Posts: 172
Joined: 5th January 2014 - 1:03pm

Re: Miles not clocking up!

Post by kinga » 25th July 2020 - 12:08pm

Had a quick search on the internet and someone suggested taking out the shaft that has the cogs on it and rough it up with some sandpaper, so it grips the grey nylon gear at the end.
Tried it, and it all works again.
I slid a screwdriver through the cogs as I removed the central shaft to stop them falling out, and did the reverse when i had sanded down the shaft with some 80 grit.
Yippee..

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broady_6
Posts: 2618
Joined: 13th January 2009 - 8:55pm

Re: Miles not clocking up!

Post by broady_6 » 7th August 2020 - 10:48pm

Sorry im a bit slow getting back to you! A combination of being very busy and then unwell. Im glad youve got it sorted!
The sultan of swing

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