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Speedometer/Tachometer flutter #360186 02/26/11 1:18 pm
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MexicoMike Offline OP
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Is this just standard for the Smiths instruments? I seem to recall my original 71 commando did the same thing. I have lubed the cables with engine oil but it doesn't seem to make any difference either way. Is there such a thing as a non-fluttering oem tach/speedo? If so, what's the trick?

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Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360200 02/26/11 2:42 pm
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bmwr90s Offline
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Mike, I had the same problems with my tach and speedo. I found this on youtube.

http://www.youtube.com/watch?v=EoTkZGleYbM

I bought the book and after the repairs the tach is steady as a rock but I was unsuccessful with the speedo repair.


Art

Last edited by bmwr90s; 02/26/11 2:42 pm.

1969 XLH
1973 Norton Commando
1991 FLHTC W/SIDECAR
Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360205 02/26/11 3:07 pm
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old-grizz Offline
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Mike - had the same problem with my 72; tried the fix but was totally unsuccessful. Managed to ham-fist everything so badly that I finally boxed up the pieces and sent them to a rebuilder. Rebuilder sent me a new unit ( or at least a rebuilt unit - not MY unit ) that was no better than what I started with . . and I was out $200 plus.

Note that if you do-it-yourself, no matter how careful you are, the bezel shows signs of a forced entry - take a look at the video and you will see the "tool marks" on the bezel following removal and still there after re-installation.

IF it were mine to do over again, I think I would just live with the wavering needle. Mine was + or - about 5 mph; like you, I tried all sorts of lube tricks, trim/square the drive ends . . . all for naught. I must therefore assume that, in Olde Englande, if you were within 5 or 10 of what you thought was right and good, the Crown would accept it.

Hope someone comes through in the forum with a good, quick, cheap, easy, DIY fix, though. Like you, I am troubled by the approximations of speed and rpm.

-O.G.

Re: Speedometer/Tachometer flutter [Re: old-grizz] #360228 02/26/11 6:15 pm
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charliechan Offline
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Doesn't it have something to do with the inner cable not being seated into the drive and/or tach speedo correctly or being to long?

Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360741 03/01/11 7:01 pm
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HawaiianTiger Online Content
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Even the slightest kink in the inner cable will cause that. So, rebuilding your instrument may not solve the problem.
Bill


Bikes
1974 Commando
1985 Honda Nighthawk 650
1957 Thunderbird/T110 "Black Tiger"
Antique Fans: Loads of Emersons (Two six wingers) plus gyros and orbiters.
Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360768 03/01/11 9:00 pm
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MexicoMike Offline OP
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I pulled the speedo cable out of the sheath- cleaned the cable and the sheath and lubricated same. THere are no kinks in the cable run. Put it back together and it did the same as before - a 5MPH flutter. Re the tach- I couldn't pull the cable out of the sheath since it has fittings crimped on both ends but I pressurized solvent and then lube through it and refitted it. It has the same "5MPH" flutter (movement wise) as the speedo.

It's not really that bad but it would be cool to have them not fluttering at all. Since they (tach/speedo) both flutter the same amount, I figure it's an instrument thing, not a cable thing. But I'm no expert and could easily be wrong about that.

Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360819 03/02/11 2:01 am
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aceaceca Offline
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I went thru this with a car speedo when I made up the inner cable by cutting the cable and soldering the drive square on the end. If the drive square has any wobble in it in relation to the cable you will get speedo flutter. My two cents worth.

Re: Speedometer/Tachometer flutter [Re: MexicoMike] #360967 03/03/11 12:26 am
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JD Offline
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MexicoMike-take a look at this thread. I bought the book and posted my repair experiences there. It really is a simple device. In fact, Graham, the author of the book, even chimed in! My speedometer was fluttering about 20 mph, so I had a much bigger problem. As old-grizz pointed out, your bezel will show signs of forced entry, but it didn't matter to me since this is hidden inside the rubber speedometer/tachometer cups.

For the cables, I removed the inner from the outer and sprayed it down with lithium grease. Since we use it on our work boats all the time, it was readily available and seems to do the trick!


Josh
Re: Speedometer/Tachometer flutter [Re: MexicoMike] #361141 03/03/11 11:27 pm
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DogT Offline
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You can test the clock with an electric drill to see if the problem is the clock or the cable. Reverse speed I think. I think most of the problems are the cables, unless of course there is a lot of age or mileage on the clock. Or it has been left in the elements too long.

Dave
69S


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