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Old 08-04-2014, 02:37 AM   #1
oldenoughtoknowbette OP
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Joined: Jul 2014
Location: Suffolk, England
Oddometer: 11
Gearbox earth/speedo screw

The threaded hole in the gearbox cover for the earth/ground and speedo retaining screw is pretty much stripped. The bikes an early R90S.
Normally I'd stick in a coil repair or a Timesert but there's very little alloy surrounding the hole and not enough I would think to drill and tap.
I'm reluctant to change the gearbox cover as it's an early kick-start version.
It's unlikely to be the first time this has happened therefore does anyone out there have any suggestions how this might be fixed?
Many thanks,
Dave.
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Old 08-04-2014, 03:11 AM   #2
boxerboy81
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I'd leave it well enough alone. Consider manufacturing or buying a new and longer battery neg cable and re-route it to one of the trans bolts. You'll never have to worry about it again.

For those with an intact breather screw thread, consider as many have already, using the battery end of the cable to disconnect. It's a nice bit of prevention strategy that also ensures the battery cable is well tightened.
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Old 08-04-2014, 03:21 AM   #3
ianboydsnr
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Quote:
Originally Posted by boxerboy81 View Post
I'd leave it well enough alone. Consider manufacturing or buying a new and longer battery neg cable and re-route it to one of the trans bolts. You'll never have to worry about it again.

For those with an intact breather screw thread, consider as many have already, using the battery end of the cable to disconnect. It's a nice bit of prevention strategy that also ensures the battery cable is well tightened.
Me too, I would make a longer lead to the bolt above the clutch cable holder at the front of the gearbox, then wrap the speedo bolt in ptfe tape, then screw back in, if that makes sense!
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Old 08-04-2014, 03:22 AM   #4
oldenoughtoknowbette OP
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gearbox earth screw

Thanks for that. I'd pretty much decided to reroute the earth cable. Considered thread-locking the screw in place but then if I ever need to replace the speedo cable.....
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Old 08-04-2014, 07:17 AM   #5
oldenoughtoknowbette OP
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Thanks . Yes, PTFE tape would solve that one too. Another design classic from BMW!
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Old 08-04-2014, 08:42 AM   #6
bpeckm
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Agree with all the above: move the gound strap to a different bolt (and in hte future always un-do it at the battery!) and just wrap the bolt with enough teflon-tape to enhance the diameter, and install gently. It is thereafter there only as a transmission vent (small hole drilled lengthwise) AND to hold the speedo cable in place. It doesn't have to have any stress on it, once you remove the ground strap....

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