GS1100 Swinger on a 1000 V Stock Steel

[John Kat]

Im confused to what you are saying here??

The axle isnt what needs to be altered it is the swingarm pivot bolt or the swingarm pivot mounting in the motorbike's frame.

It is easy to drill it out, I just want to make sure I do it properly, and keep it aligned with the original hole so using a magnetic lineboring drill is the easiest solution, especially as I have access to that drill

Sorry for the confusion here
What I'm talking about is the shaft pivot ( part #4 on this diagram http://www.cmsnl.com/suzuki-gs1000-1978-ec_model13504/partslist/FIG-49.html) not the rear wheel axle.
In my case the needle bearings on the "shaft pivot" were the same on both models except for the inner race that's adapted to the diameter of the "shaft pivot"
The idea is to exchange the inner races only without changing the "shaft pivot" thus avoiding to drill the frame.
I hope it's a little more clear this time?

 

[Rover]

1000 application different than 750.

 

[allojohn]

Sorry for the confusion here
What I'm talking about is the shaft pivot ( part #4 on this diagram http://www.cmsnl.com/suzuki-gs1000-1978-ec_model13504/partslist/FIG-49.html) not the rear wheel axle.
In my case the needle bearings on the "shaft pivot" were the same on both models except for the inner race that's adapted to the diameter of the "shaft pivot"
The idea is to exchange the inner races only without changing the "shaft pivot" thus avoiding to drill the frame.
I hope it's a little more clear this time?

Hang on a minute, let me get this clear. Are you saying the bearing pivot spacer from the GS1000 will fit the GS1100 swing arm bearing and allow use of the 14mm pivot shaft from the GS750?
I hope this is correct because I have the same issue and I'm really leery about reaming out the frame.

 

[allojohn]

Hang on a minute, let me get this clear. Are you saying the bearing pivot spacer from the GS1000 will fit the GS1100 swing arm bearing and allow use of the 14mm pivot shaft from the GS750?
I hope this is correct because I have the same issue and I'm really leery about reaming out the frame.

I should have said "allow use of the 14mm pivot shaft from the GS1000?"

Does the GS1000 use a 14mm pivot shaft like the GS750?

 

[TheCafeKid]

Hang on a minute, let me get this clear. Are you saying the bearing pivot spacer from the GS1000 will fit the GS1100 swing arm bearing and allow use of the 14mm pivot shaft from the GS750?
I hope this is correct because I have the same issue and I'm really leery about reaming out the frame.

nooo

The 750 pivot is smaller... thus the frame boss is smaller.. You either use some bearings with the same ID as the 750 pivot, and OD of the 1100 swingarm, or you drill the frame to accept the 1100 swinger.

On a 1000, its a direct swap. Im not even sure what he's talking about..

 

[John Kat]

Hang on a minute, let me get this clear. Are you saying the bearing pivot spacer from the GS1000 will fit the GS1100 swing arm bearing and allow use of the 14mm pivot shaft from the GS750?
I hope this is correct because I have the same issue and I'm really leery about reaming out the frame.

I'm only saying that it's worth investigating as this trick worked when I upgraded my GS 1000 to a GSXR 1100 swing arm.
As I'm travelling currently I can't provide the inner and outer diameters of the GS 1000 pivot spacer.
Maybe someone else can step in ?
What I know is that the needle bearings for the GS 1000 and the GS 1100 are identical.

 

[salty_monk]

He's correct but it doesn't work for the 750 the same way.
The needle bearings on the 1000/1100 are identical & you use the correct inner bush (the big lump that the bearings roll on & the pivot shaft goes through described above as the inner race which is more correct I would guess) for the size of the pivot shaft (axle).

On the 750 it's a smaller Pivot shaft, I don't think a custom bearing is available but it's possible you might be able to source one to save drilling out the frame...

 

[allojohn]

Yep, we need a pivot bearing spacer with an OD of 25mm and ID of 14mm.

 

[GregT]

See your bearing supplier for a roller bearing inner race of the right length and with a 25mm OD. It will probably have an ID around 19 - 20 mm.
Easy enough to machine up a bush from mild steel with the right ID and press into the bearing inner race.
It's only the outer surface of the bearing race which has to be hardened, so long as the ID is a good fit on the pivot bolt all's sweet.

 

[salty_monk]

I would think you could machine a bush to go inside the GS1100 one in the same way to downsize to the correct axle (Pivot shaft) dia... but I've not done this mod on a 750.

 

[allojohn]

Unfortunately I do not possess the equipment to machine dip, so I'm looking for a local machine shop small enough to care about such a little job.

 

[GS750]

See your bearing supplier for a roller bearing inner race of the right length and with a 25mm OD. It will probably have an ID around 19 - 20 mm.
Easy enough to machine up a bush from mild steel with the right ID and press into the bearing inner race.
It's only the outer surface of the bearing race which has to be hardened, so long as the ID is a good fit on the pivot bolt all's sweet.

the GS750 swing arm bearing is 22 x 29 x 30 and the GS1100 is 25 x 33 x 30

I know, I measured them today I am not going to bother machining new spacers to take the 14mm bolt, or source odd size bearings , just going to drill the frame out

There is still going to be plenty of meat left on that pad after taking it out from 14mm to 16mm