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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 09-27-2012, 02:30 AM   #1 (permalink)
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Most efficient (easiest) way to lube speedo cable?

I just bought a 2009 bonnie SE from a private party with 12k miles and I noticed 2 problems while on the freeway.

1) The speedometer reading is wildly off. It would say 70mph when I'm going ~55mph. Also, the tires are new and 500 miles in but I can't see why that would affect the readings so much.

2) Noise (sounds like front brake screeching) whenever I downshifted - freaked me out at first thinking my front brake was going to throw me off the bike.

After some searches, it seems that perhaps the speedo cable is the culprit.

Questions:

1) What's the most efficient (easiest) way to lube speedo cable for an ignorant novice?

I've read about people disconnecting from the top or the bottom or both. Without doing both, I can't understand how you'd be able to lube the whole cable.

2) What lube do you guys recommend? I have Du Pont Teflon chain lube, and I'm not sure if that's ok to use or not...

Thanks All!

Last edited by firstblud; 09-27-2012 at 02:33 AM.
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Old 09-27-2012, 02:52 AM   #2 (permalink)
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It's really easy to pull the speedo cable from either end. My preferred method is to pull it from the bottom at the wheel. Just one screw and it's off and the cable slides out. I cleaned it with some solvent and a rag, then used some 321 light oil on a rag to lube it up again. It just slides right back up the guide into the speedo and line up the spline at the hub. Tighten the screw and you're done.
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Old 09-27-2012, 03:04 AM   #3 (permalink)
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Ok it's too dark outside for me to check, but my curiosity is killing me:

so when i guide the inner cable up the sheath, how will i know for sure if it reconnects to the speedometer? i just have to ride it i suppose? and thank you

Last edited by firstblud; 09-27-2012 at 03:08 AM.
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Old 09-27-2012, 05:22 AM   #4 (permalink)
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Ok it's too dark outside for me to check, but my curiosity is killing me:

so when i guide the inner cable up the sheath, how will i know for sure if it reconnects to the speedometer? i just have to ride it i suppose? and thank you
You'll find that until it connects properly with the speedo head the cable appears not to fit fully into its sheath.

Push it up as far as it'll go and twiddle it with your fingers while pushing until you feel it engage. At that point it'll "fill up" the sheath completely.
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Old 09-27-2012, 05:58 AM   #5 (permalink)
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Push it up as far as it'll go and twiddle it with your fingers while pushing until you feel it engage. At that point it'll "fill up" the sheath completely.

Oh my loooord I thought this was a motorbike forum!
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Old 09-27-2012, 06:28 AM   #6 (permalink)
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Old 09-27-2012, 06:40 AM   #7 (permalink)
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Hello

Normal procedure is not to lube the top six inches of cable (stops it migrating into the speedo head) and consider using light grease instead of oil.

Regards

Barry
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Old 09-27-2012, 06:52 AM   #8 (permalink)
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Oh my loooord I thought this was a motorbike forum!
Damn...I've forgotten about British humour and its "double entendre"...
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Old 09-27-2012, 07:46 AM   #9 (permalink)
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Damn...I've forgotten about British humour and its "double entendre"...

I'm sorry mate but it was just too irresistible - childish,? yes; funny? definitely !!!!
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Old 09-27-2012, 12:54 PM   #10 (permalink)
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Does anyone know if a bad speedo cable can also cause screeching noises that sound like a tire locking up on the front side? I felt pretty certain that the sound was in the front, but it'd make more sense for it to be in the back.
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