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charles.walmsley
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VBMWMO #9061
Albany
Joined: 01/23/2016
Posts: 12

Ive noticed that the tac needle for my 75 R90S starts to jump heaps once I get to around 3000 revs. When I say the needle jumps im talking from one end of the tac to the other. Bumps on the road make it worse but even on flat surfaces it does the same thing. Could it be just a worn out speedo cable or something else?

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
I would definitely change the

I would definitely change the tachometer cable. I'd also not ride the bike anymore or at least disconnect the cable until this is fixed. Eventually the tach side will be damaged and your repair bill jumps quite a bit.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

MikeL46
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VBMWMO #9300
Joined: 01/01/2016
Posts: 38
Have you lubricated the

Have you lubricated the cable? And not with oil.

Mike

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67 R50/2 w/R100 engine/trans and Ural Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar

charles.walmsley
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VBMWMO #9061
Albany
Joined: 01/23/2016
Posts: 12
I havent done anything yet

I havent done anything yet but I might try lubricating the cable first. Is it best to use a spray like inox or WD-40?

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6327
Don't use WD-40...it's a

Don't use WD-40...it's a dirt-attracter. Best to use something like Tri-Flow.

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Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2

MikeL46
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VBMWMO #9300
Joined: 01/01/2016
Posts: 38
I would use a graphite

I would use a graphite lubricant. Oils and greases attract dust and gum up. Just like on key locks. Oils and greases are great for control cables (clutch, brake, throttle) but not for speedo/tach cables that rotate at fairly high rates.

Pull the inner cable out and shoot the graphite in then reinstall the inner.

Mike

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67 R50/2 w/R100 engine/trans and Ural Sidecar
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar

brownbmw
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VBMWMO #7491
So. Cal.
Joined: 01/03/2009
Posts: 89
No need to lube these cables.

No need to lube these cables. If that is the cause of the needle fluctuation then it is either kinked or has a broken wire strand and needs to be replaced. If it's not the cable then there's a problem in the tach.
Since "bumps on the road make it worse" it is very unlikely that the cable is the issue.

charles.walmsley
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VBMWMO #9061
Albany
Joined: 01/23/2016
Posts: 12
Have been on holidays so I

Have been on holidays so I will have a look at it soon. Thanks heaps fellas

charles.walmsley
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VBMWMO #9061
Albany
Joined: 01/23/2016
Posts: 12
Process

What are the steps in order to remove the cable to inspect and possibly lubricate?

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