Triumph Tiger Gauge Vibration


Motorcycle Classics tech expert Keith Fellenstein

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Q: I have a 1977 Triumph Tiger. I have a recurring problem with both the tachometer and speedometer. At higher speeds (50mph-plus) that generate greater vibration, the entire gauge begins to rotate within the black rubber housing that holds the gauge. As it rotates, the lighting fixture/bulb comes loose and then falls out of the gauge. I then have to remove the gauge and rubber housing from the chrome bracket that holds them, remove the gauge from the rubber housing and then re-seat the gauge so that the opening for the bulb lines up with its matched opening on the rubber housing. You may very well have heard of this before. Any ideas how I can prevent this from happening (besides keeping my speeds under 50mph)? Thanks for your help and for your terrific columns in Motorcycle Classics. — Ron/via email

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A: In addition to the vibration, you have the torque reaction of the instrument against the rotation of the cable, too. A number of fixes come to mind, but probably the easiest one would be some double-sided tape or foam installed between each of the instruments and the cup. It wouldn't require much to hold it still against the vibration.

1/26/2018 7:52:33 PM

The gauge is supposed to he held in the rubber by two studs with nuts on them. If these are present and tight I would think the same as ricoyam that the rubber cups are worn out. TONYC, these instruments cannot be greased. If anything, I would use only graphite powder to lube the internals. Even the cable should not be greased within a few inches from where it enters the instrument. Might also help to lube the cables. Remove the inner cable, clean and grease. Chain lube spray also works well.

1/25/2018 11:20:33 AM

In response to Tonyc, I suspect it's happening to more than you realize. Over the past 40 years those rubber mounting cups have dried and shrunk and no longer hold the instrument like they used to. I had a TR6 which did the same thing. I'm pretty sure those cups are available and might be the best solution to just replace them.

1/25/2018 10:02:37 AM

Obviously the "torque reaction" diagnosis seems accurate, but I'd be inclined to dig deeper. Why isn't this happening to every one? It suggests to me that the torque is excessive, or the ability to resist it has been weakened. Is there too much friction in the gauge itself, requiring more torque to drive it? I'd be inclined to grease the mechanism.

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