thread knackered on lower suspension mount

[queenmonkey]

I've recut the other studs with a 10 x 1.25 die but one of the lower stud wont play ball and there seems to be not much of a recut thread on it.

I'm looking for an easy fix as this bike is no keeper and i really don't want to strip it down to the frame. Could i recut it to a coarse thread 10 x 1.5 or should i go for a smaller diameter? Surely this must be a common problem for the GS850 as the shocks need to be off (or at least the top mounts) to get the rear wheel out.

Any suggestions?

Thanks in advance.
QM

[AJ]

I'm not familiar with the bike, but assume from your description that it is eye-to-eye on the shock vice eye-to-fork.

If it's a stud, I would not try to cut a coarser thread. Instead, perhaps you could add a couple weld beads on the thread, file to reshape, and then recut the proper threads? Brass brazing might also be sufficient and probably easier to cut new threads.

[BassCliff]

Hi,

The lower shock mount? On which side?


Thank you for your indulgence,

BassCliff

[queenmonkey]

I'm not familiar with the bike, but assume from your description that it is eye-to-eye on the shock vice eye-to-fork.

If it's a stud, I would not try to cut a coarser thread. Instead, perhaps you could add a couple weld beads on the thread, file to reshape, and then recut the proper threads? Brass brazing might also be sufficient and probably easier to cut new threads.

Thanks for the reply Ajay. I'm relucatant to put any heat into it as it's likely to break. I'm thinking of recutting the thread to M9.

QM

[bwringer]

Hi,

The lower shock mount? On which side?


Thank you for your indulgence,

BassCliff

Assuming you're talking about an 850...

What BC is hinting at is that the lower shock mount stud on the left is replaceable -- it screws into the final drive casing.

Part 24 on this diagram:

http://images.powersportsnetwork.com/fiche/images/SUZUKI/1982/Motorcycles/2144_19.gif

The part is no longer available new, but I know lots of us have one or two of these final drive units lying around, so you should be able to get one of those studs easily.

I suspect this is the one you're dealing with, because on the right, the swingarm has a fork to accept the shock eye, and it should be obvious you can just install a longer bolt with a nut.

[queenmonkey]

Hi all and thanks for the replies. The stud is the lower on the right hand side. It seems to fastened well and truly into the swing arm with no opportunity to remove without taking off the swing arm and drilling out - don't really want to do that. Ironically i have a spare drive shaft housing with a perfectly good left hand lower stud.

QM

[salty_monk]

Try giving a bit more info... Bike, Year, Location & a picture speaks a thousand words in these cases...

[queenmonkey]

Try giving a bit more info... Bike, Year, Location & a picture speaks a thousand words in these cases...

Hi bike is a 81 GN/ GL with bits from bot and in cafe racer trim. Shocks are 70's piggy back marzochi's. Stud on right seems to have a large circular head that is spot welded into the rear of the swinging arm.

QM

[salty_monk]

Pics please.... it sound like you have something that has been modified in the past.

One idea that comes to mind is to cut it close to the arm, drill from the outside in & use a nut & bolt but I don't think you should have a welded stud in that location, that doesn't make sense with the G swingarm as I know it....

If it's only the thread on the end & the stud the shock fits on is ok (assuming this is something like a standard top mount) then you idea of going to a smaller thread would likely work as none of the force is applied outwards in that direction...