1978 RS throttle cables

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vmx1200
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1978 RS throttle cables

Postby vmx1200 » Fri Mar 15, 2019 1:24 pm

Having a bit of a challenge replacing the throttle cables on the RS (should have taken a picture months ago)

My machine has the twin cables not the single into two type, has anyone got any clear pictures or diagrams of the routing as the way I have tried allows to little free play when on full lock.

Thanks as always
1978 R100RS owned since 1981
2017 R Nine T Pure

Mjolinor
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Re: 1978 RS throttle cables

Postby Mjolinor » Fri Mar 15, 2019 3:17 pm


vmx1200
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Re: 1978 RS throttle cables

Postby vmx1200 » Fri Mar 15, 2019 4:09 pm

Thanks for this Mjolinor, the extra challenge with the RS is the routing of the cables through the fairing mounting "metalwork", this isn't the same as the non faired models.
1978 R100RS owned since 1981
2017 R Nine T Pure

Mjolinor
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Re: 1978 RS throttle cables

Postby Mjolinor » Fri Mar 15, 2019 4:31 pm

The throttle cables go right under the rev counter cable. Such that if you do not put the rev counter cable on before hte throttle cables it is a real dog to get on. The reverse is also true, if you put the rev counter cable on first then the throttle cables, when routed correctly, will not sit nicely and always seem screwed.

That may help you or it may not. I routed them several ways and it never seems to be correct. If I remember I will take a picture of it next time I am where the bike is.

vmx1200
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Re: 1978 RS throttle cables

Postby vmx1200 » Fri Mar 15, 2019 7:57 pm

Thanks .... 78 models have electronic rev counter so no cable and no hole for it to go through, all our bikes are so similar but so different :lol:
1978 R100RS owned since 1981
2017 R Nine T Pure

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andyb
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Re: 1978 RS throttle cables

Postby andyb » Fri Mar 15, 2019 8:42 pm

I would think you are best just trying different routes until the cables fit correct - your current cables may not be the same length as O/E ones. Make sure you have slack at full lock each way and that the cables do not pull out of the hand throttle. Cable ties between the two cables can help them stay in place.
AndyB
R100R work-day-bike
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CharlieVictor
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Re: 1978 RS throttle cables

Postby CharlieVictor » Fri Mar 15, 2019 10:00 pm

I have the basic S (1978) and I understand it's a bit different for the RS. But if this can help....

The bike never ran properly with the cables following the OEM path, under the tank. Synch was a nightmare, the cables would loosen or tighten constantly.
On advice from an airhead guru on a French forum, I ended up installing them lose, with nylon ties around the frame's tubes. When I got the perfect setting and no idling alteration lock to lock, I tightened the nylons ties and never got any issue ever since.

I can probably take a picture if needed.
1978 BMW R100S "Naked"
1999 W650 RS "Twin with a kick"

Roy Gavin
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Re: 1978 RS throttle cables

Postby Roy Gavin » Fri Mar 15, 2019 11:29 pm

If cables are to stay in adjustment the outer should be free to move , so if you do tie then up best to use a sleeve - split corrugated electrical conduit works OK.

vmx1200
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Re: 1978 RS throttle cables

Postby vmx1200 » Sat Mar 16, 2019 2:23 pm

Thanks for the replies everyone, the cables were routed correctly through the fairing / headlamp bracket and through the gusset of the headstock / frame.

What I had done was caught them under the cable ties I fitted around the wiring harness, I had cut the originals off so I could replace the horn relay which I couldn't remove without lifting the harness.
1978 R100RS owned since 1981
2017 R Nine T Pure


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