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JakeF
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VBMWMO #9236
Southern California
Joined: 12/02/2016
Posts: 82

I replaced the throttle cables and the grip only wants to rotate at most 1/4 turn. I know that can't be right. I figure I should get at least a 1/2 rotation. Am I right? The bike was non-op when I got it so I am having to thru everything. Does the small chain inside stretch over time? Appears to be a bit too much slack. Any suggestions would be appreciated as well as a current R90S owner checking to see how much rotation the throttle grip should have.

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JakeF
1956 R69, 1976 R90S, 2008 R1200GS

schrader7032
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VBMWMO #7032
San Antonio, TX
Joined: 10/27/2006
Posts: 6540
The throttle configuration is

The throttle configuration is a little complicated/fiddly. I don't think the chain wears all that much, but certainly it must be lubricated with some grease that is not going to stiffen when cold. Likely your problem is not properly engaging the teeth on the throttle tube with the teeth on the small wheel in the perch. If you engage them too far to one side, you'll run out of throttle tube rotation before it hits the internal stops. On some models, there are marks on the wheel and the throttle tube that need to be lined up as you put things together. It's fiddly in that the two throttle cable ends need to kept in their slots as you lower the top down onto the base while keeping the chain properly oriented and finding those marks for alignment.

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

JakeF
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VBMWMO #9236
Southern California
Joined: 12/02/2016
Posts: 82
Problem solved

It had nothing to do with the grip. I took the cables out of the grip and then pulled on each throttle cable manually. One was fine and other felt jammed. When I removed the top of the carb with one that was jammed I found that the small lever attached to the carb piston was not properly seated in its track. It was hanging up in the large spring. Once that was corrected everything worked fine. Now if I can just get the brakes bled it will be ready to try and start. I can't get pressure back into the overhauled brake system and have read up on how this issue has frustrate many R90S users. Will try a new tact tomorrow on that issue.

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JakeF
1956 R69, 1976 R90S, 2008 R1200GS

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