Speedo not working properly

Speedo not working properly

Postby Alan W » Sun Jul 03, 2011 8:13 pm

The speedo on my 79 (50thousand kilometers) is reading slow and bouncy. I take it up to about 60 - 100kph it takes a long time to get there then stays on the speedo reading even while slowing down. No problems with accuracy, the cables working fine. Any help advice would be appreciated.
Alan W - South Australia
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Re: Speedo not working properly

Postby EMS » Sun Jul 03, 2011 8:19 pm

Typical behavior of a speedo that is older and sat for a while without moving. I had one that did exactly this and it corrected itself after a while. No idea what you could do to remedy this. Be careful with generous oiling, you could stain the face.
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Re: Speedo not working properly

Postby steve murdoch icoa #5322 » Mon Jul 04, 2011 7:23 am

Welcome to the site, Alan.
Could it just be crud built up at the wheel?
Even with the tight seal at the speedo drive, road grime can seep in.
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Re: Speedo not working properly

Postby NobleHops » Mon Jul 04, 2011 7:24 am

Alan W wrote:The speedo on my 79 (50thousand kilometers) is reading slow and bouncy. I take it up to about 60 - 100kph it takes a long time to get there then stays on the speedo reading even while slowing down. No problems with accuracy, the cables working fine. Any help advice would be appreciated.
Alan W - South Australia


Welcome Alan!

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'80 CBX, sort-of restored :-)

http://noblehops.smugmug.com/Motorcycles/The-Not-Restoration-of-My/5334012_jN2Rnx
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Re: Speedo not working properly

Postby Don » Mon Jul 04, 2011 9:07 am

Alan W wrote:I take it up to about 60 - 100kph it takes a long time to get there then stays on the speedo reading even while slowing down. No problems with accuracy, the cables working fine
Your symptoms are exactly the same as we usually see with tachometers. In my case, adding a few drops of very light machine oil (We have a product called 3 in 1 oil here, usually used on sewing machines and such) around the movable part of the instrument where the cable attaches. I left mine upside down overnight for the oil to soak in and the next day, may tach was behaving normally again. As Mike admonishes, don't overdo it with the oil . . . . a few drops is all you need

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