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 Post subject: Bouncing speedometer
PostPosted: Tue Oct 18, 2016 3:16 pm 
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Joined: Tue Jul 05, 2016 6:25 am
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Location: Lithuania
I have problem with bouncing speedometer. Going on 3rd gear @ 4000 rpm speedometer shows 140 km/h. If I realese thortle speedometer starts to show ~70 km/h and bouncing near 70 km/h. Odometer looks like works fine. If I ride about 40 kilometers it shows about 40. There problem can be? Speedo cable is new.


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 Post subject: Re: Bouncing speedometer
PostPosted: Tue Oct 18, 2016 4:18 pm 
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Adventure Rider
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Joined: Fri Jan 08, 2016 6:37 pm
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Location: City of Angels
Sure the new cable is properly seated in the speedo and the drive???

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 Post subject: Re: Bouncing speedometer
PostPosted: Tue Oct 18, 2016 4:20 pm 
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Location: Lithuania
I think properly. For me strange what odometer works fine.


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 Post subject: Re: Bouncing speedometer
PostPosted: Tue Oct 18, 2016 5:50 pm 
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Ensure the cable is properly lubed and has no kinks.

Older cables often need relubed.

I'm talking about the whole length of the cable, not just the ends :s_wink


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 Post subject: Re: Bouncing speedometer
PostPosted: Tue Oct 18, 2016 6:56 pm 
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Trail Rider
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Location: Mt Vernon, IN
archyvaras wrote:
I think properly. For me strange what odometer works fine.



Not strange at all. The odometer works counting rotations. Does not care about speed. Check the cable as told above. It's either that or a damaged speedometer. My bet is on the cable though.
You can detach the end from the wheel side and check if it rotates smoothly by hand.


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 Post subject: Re: Bouncing speedometer
PostPosted: Wed Jan 25, 2017 8:27 pm 
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Joined: Tue Apr 19, 2016 6:03 pm
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Location: Santiago, Chile
archyvaras wrote:
I have problem with bouncing speedometer. Going on 3rd gear @ 4000 rpm speedometer shows 140 km/h. If I realese thortle speedometer starts to show ~70 km/h and bouncing near 70 km/h. Odometer looks like works fine. If I ride about 40 kilometers it shows about 40. There problem can be? Speedo cable is new.

Had the same problem. Had to buy a chinese tach since the original came in mph, but the new one had its needle bouncing. Opened it and adjusted the magnet distance. Voila! Works perfectly


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 Post subject: Re: Bouncing speedometer
PostPosted: Wed Jan 25, 2017 10:12 pm 
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Joined: Fri Jan 15, 2016 11:05 pm
Posts: 255
Location: Albany, West Oz
Mito57 wrote:
archyvaras wrote:
I think properly. For me strange what odometer works fine.

Not strange at all. The odometer works counting rotations. Does not care about speed. Check the cable as told above. It's either that or a damaged speedometer. My bet is on the cable though.
You can detach the end from the wheel side and check if it rotates smoothly by hand.

Mito57 is entirely correct. In effect, the speedo and odo are just 2 separate instruments housed in the same case. The odo is mechanically connected to your front wheel. The speedo is magnetically connected to your front wheel. The best advice has already been given: Remove, clean and lubricate the speedo cable. Do it right straight up.
1. Remove the entire speedo cable - inner and outer.
2. Use solvent (petrol will be fine) to clean out the outer cable and also thoroughly
wash/degrease the inner cable. You want both to be completely
clean and degreased.
3. Lightly smear any garden variety automotive grease all over the inner cable.
You don't want heaps of big dags of grease - a light smear along the entire length.
4. Put it all back together and test run it.

Chances are it'll be fixed. If not, 99.837% chance it's in the speedo mechanism itself. Not considered repairable! Most (the vast, VAST majority) are cheap, crappy, mass-produced pieces of junk for which no parts or service/calibration instructions are available. Even when I was working in my trade (Scientific Instrument Maker and Repairer), where I had calibration equipment, I only tried a couple of times before I decided that replacement was the only real option. Working on them is entirely a hit and miss affair.

If that's the case get an aftermarket alternative (Vapour, Koso, Acewell, etc) which you can calibrate to a high degree of accuracy without the need for professional help. Also, without the need for a speedo cable - always a bonus!

topic19628-50.html Look at the top of page 6.

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