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Author Topic: Speedometer Bounce  (Read 1988 times)

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Offline cadler

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Speedometer Bounce
« on: October 30, 2006, 05:25:43 AM »
What causes the speed to bounce around, Is it the Cable or the cable?
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Offline nippon

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Re: Speedometer Bounce
« Reply #1 on: October 30, 2006, 05:33:07 AM »
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Offline kpier883

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Re: Speedometer Bounce
« Reply #2 on: January 03, 2011, 06:17:47 PM »
I am just correcting the links as they are in the old format.  

http://forums.sohc4.net/index.php?topic=4257.0
http://forums.sohc4.net/index.php?topic=12745.0
http://forums.sohc4.net/index.php?topic=1955.0

And adding this link that shows dis-assembly, lubrication points, and re-assembly:
http://www.salocal.com/sohc/tech/speedo/spedo1.htm

Hopefully this will help others like me who are searching for gauge help.


« Last Edit: January 03, 2011, 06:26:50 PM by kpier883 »
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Offline bird

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Re: Speedometer Bounce
« Reply #3 on: January 03, 2011, 07:20:59 PM »
Mine did the same. Try taking it to a reputable instrument rebuilder for a test. You may find certain internals have just got old and worn out over time. If you're thinking cable, ride the bike with the cable unscrewed, attach it to something with a zip-tie or wire, and see if turns freely at speed. Oh, and don't forget to watch the road ahead
while you're at it! Good luck. 
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Offline Brandotheamazing

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Re: Speedometer Bounce
« Reply #4 on: January 03, 2011, 08:39:22 PM »
Age, age makes speedo's bounce! good luck. my speedo and tach bounce, i'm used to it now. but will take care of it when i get into a full resto...
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-Brendan

Offline Hush

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Re: Speedometer Bounce
« Reply #5 on: January 03, 2011, 08:48:05 PM »
My tacho is fine but once I get over 70 mph the speedo thinks it's a gieger counter and it's all guess work after that. ;)
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline florence

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Re: Speedometer Bounce
« Reply #6 on: January 04, 2011, 08:00:45 AM »
They all do that Sir!  Just take an average and guess, easier said than done when Mr Plod is following.
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Offline dave500

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Re: Speedometer Bounce
« Reply #7 on: January 04, 2011, 01:55:55 PM »
is the cable lubed?if its old it may need replacing,i shimmed the worm drive in my lower unit and it displays more stable.
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Offline TwoTired

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Re: Speedometer Bounce
« Reply #8 on: January 04, 2011, 02:16:50 PM »
The "bounce" can have a couple of sources.  It is not normal unless pot holes are involved.
Could be the cable, sticking/squirming inside the sheath.   New graphite and light mineral oil should cure that.
...Unless the cable was smashed or kinked at some time.   If so, you can examine the inner cable and look for rub marks.  Finding these, replace the cable.

Another possible cause is the speedometer itself.  The needle is attached to a bell which spins inside (or outside) in close proximity to another bell attached to the drive cable.  One of the bells has a magnet which is the coupling mechanism between cable and needle.
If the bearings that the bells ride in get loose, the bells may make actual contact, sending the needle off target at regular intervals.  When the bearings get bad enough, the needle spends most of its time at the top limit stop due to friction between the two bells.

Cheers,
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Lloyd... (SOHC4 #11 Original Mail List)
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Offline Hush

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Re: Speedometer Bounce
« Reply #9 on: January 05, 2011, 01:43:04 AM »
Yes TT time I pulled my cable out for a looksee and time you changed your avatar picture, that one just gives me the creeps!
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I think the thing I most like about motorcycling is the speed at which my brain must process information at to avoid the numb skulls who are eating pies, playing the ukulele, applying make-up etc in the comfort of their airconditioned armchairs as they make random attempts to kill me!!!!!!!

Offline dave500

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Re: Speedometer Bounce
« Reply #10 on: January 05, 2011, 01:52:22 AM »
change it to a mosquito drawing blood!
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