Sppedometer cable breakage


Information and questions on GL1100 Goldwings (1980-1983)
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vodka72
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Sppedometer cable breakage

Postby vodka72 » Mon May 31, 2010 2:13 pm



I have had 2 speedometer cables break in 10 days on my 81 GL1100. There are no visual kinks in the casing, and the speedometer works flawlessly until the cable breaks. Cable breaks where the metal is joined to the speedometer cable core on the wheel size. Any idea what could cause this and how to check it?



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WingAdmin
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Re: Sppedometer cable breakage

Postby WingAdmin » Mon May 31, 2010 9:40 pm

If the speedometer drive (that piece on the side of the wheel) is not positioned correctly, it will cause the cable to flex every rotation, which will quickly break it. The drive should be rotated such that the cable comes straight out the back of it and bends as little as possible. This isn't a great example (the cable in this picture is slightly bent - it failed about a year later and was replaced) but this should give you an idea:

Image

vodka72
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Re: Sppedometer cable breakage

Postby vodka72 » Tue Jun 01, 2010 2:45 am

Its parallel to the ground, has been both times. its got plenty of slack, no tight bends anywhere, that's why its so aggravating. don't know if its meant to work at speeds over 80-85, thats the speed I usually run for 2.5 miles on my way to work the day it breaks. works fine til I back it into the stall at work.

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WingAdmin
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Re: Sppedometer cable breakage

Postby WingAdmin » Tue Jun 01, 2010 6:52 am

The speed should have no bearing on it. Do you know exactly where the cable is breaking?

vodka72
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Re: Sppedometer cable breakage

Postby vodka72 » Tue Jun 01, 2010 8:59 am

Yeah, at the wheel end. Breaks where the speedmeter gear finger molds to the cable core, same spot every time

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WingAdmin
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Re: Sppedometer cable breakage

Postby WingAdmin » Tue Jun 01, 2010 12:06 pm

That's where mine broke, but there was a definite bend at that point. Once I straightened it out, I had no problems at all. Is it possible you just got a bad replacement cable?

vodka72
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Re: Sppedometer cable breakage

Postby vodka72 » Tue Jun 01, 2010 1:09 pm

Two brand new motion pro cables, both breaking in the exact same spot? I doubt its a bad cable. If there is any binding in the wheel unit or speedo couldn't that cause this? I can send pics of what the routing has been both times and exactly where the cables have broken if you think it will help. Hard to believe there is any flex inside the metal casing end where these things keep breaking. It would almost have to have flex inside the wheel unit for it to break where it does. Is there any possible pieces I should have inside the wheel unit to prevent the cable core from flexing in there?

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WingAdmin
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Re: Sppedometer cable breakage

Postby WingAdmin » Tue Jun 01, 2010 2:32 pm

Here's an idea - is the speedo drive put on correctly? There is a little protrusion that goes between two similar protrusions on the fork leg, to keep it from moving forward and backward with the wheel. If the drive isn't put on so that this is put in the correct place, the speedo drive will shift as the wheel turns.

I can't think of anything else that would cause this, other than a bound up speedometer that is presenting too much resistance. When it's hooked up to the speedometer, can the cable be turned easily by hand at the wheel end?

vodka72
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Re: Sppedometer cable breakage

Postby vodka72 » Tue Jun 01, 2010 2:35 pm

Have to get another cable and test the speedo, I'll take a look at the wheel side see if I can find what your talking about. Hopefully thats it, hate to have to replace a speedo.




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