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Speedo accuracy

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jonhunt
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Speedo accuracy

#1 PostAuthor: jonhunt » Wed Aug 29, 2018 9:25 pm

Since replacing the Speedo cable my Speedo has gone from optimistic to ridiculous. As I accelerate it will shoot up to 100 indicated. If it was a wear issue I’d expect to be slow not fast.

deka
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Re: Speedo accuracy

#2 PostAuthor: deka » Wed Aug 29, 2018 9:52 pm

R u not twisting the throttle tooooo enthusiastically :D
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weaver
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Re: Speedo accuracy

#3 PostAuthor: weaver » Thu Aug 30, 2018 6:05 am

shite cable by the sounds of it :??

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warren3200gt
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Re: Speedo accuracy

#4 PostAuthor: warren3200gt » Thu Aug 30, 2018 7:49 am

either the cable inner is catching when its turning or the cable is poorly routed by the sounds of it. Speedo cable needs to be as inline as possible with no sharp bends.
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Charlie
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Re: Speedo accuracy

#5 PostAuthor: Charlie » Thu Aug 30, 2018 10:55 am

It is likely a vibration issue, given it increases to silly levels when the motor is revving hard. Check the mounting pads are good and that the mountings are not overtightened.
Why do I persist in debating with idiots ? I really should know better :)

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jonhunt
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Re: Speedo accuracy

#6 PostAuthor: jonhunt » Fri Sep 14, 2018 5:21 pm

Been trying to get to the bottom of this one. The Speedo now also doesn’t return to 0 at a standstill. If I tap it it will return, also if it’s at 0 I can make it jump up to 10 mph and stick, bike static. Seems likely the springs gone west. The replacement cable is probably a coincidence
Looks like a job for Al Marshall

weaver
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Re: Speedo accuracy

#7 PostAuthor: weaver » Fri Sep 14, 2018 7:05 pm

Remove cable turn inner by hand checking for tight spots remove inner and check condition,does inner slide freely in out of outer?

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jonhunt
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Re: Speedo accuracy

#8 PostAuthor: jonhunt » Fri Sep 14, 2018 9:08 pm

Cable is new. Checked it seems good. There’s no physical join between the needle and the drive cable it’s moved by magnetic eddy currents so even if the cable sticks the needle should fall to zero. My reasoning is as the spring holds the needle back to give the right spring if it breaks or weakens then the Speedo will be very optimistic. That’s what’s happening. Also it won’t push the needle back when the drive stops.

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Re: Speedo accuracy

#9 PostAuthor: ZedHead » Sat Sep 15, 2018 7:46 am

My guess would be lack of damping in the clock. Al Marshal is your go to man.


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