Page 1 of 3

R100RS centre stand repair.

Posted: Sat Feb 15, 2025 12:58 am
by SteveD
I'm hoping to get mine modified this weekend.

The plan:
1. reduce height by 13mm.
2. lay a weld across the top, a little wider than the current pressed together bits.
3. take the stand home and continue to mod it to best fit.

Question. When the stand tubes are cut and a bit removed, what is the ID of the tubing? I'll need to get something appropriate diameter to slot in there to strengthen the job. Or I could cut it and measure myself ;)

Cheers


Image Image

Well ovaled. They look better in the picture. I had one of them shimmed already. BUT...what might be the best approach to correcting the oval shape which extends the hole upwards. Add weld and shape accordingly? Enlarge the hole, weld in a spacer of the same diameter of the original hole?

Image

The spacers were the long version. A little worn, but still serviceable. I'll likely replace them. The nuts and bolts were fine.

Image

The ground contact points had a weld reinforcement maybe 10-12 years back. Held up well, but probably added 2-3mm to the height. One of the improvements is to reduce the height a little. 285mm from the bottom to the pointy bit at the top.

ImageImage

The contact points at the top were worn, sloping inwards. I need to have a good look at the frame contact points too!

Image Image

I'm awaiting confirmation from the welder to get the welds done tomorrow. Then I'll bring it home and sculpt it to fit and function on the bike. These three pics are from Jeff, ME 109. I'll be looking to do something similar.

Image Image

Image

I doubt my skills will be as elegant as Jeffs, but I'm hoping the stand ends up just as effective.

Re: R100RS centre stand repair.

Posted: Sat Feb 15, 2025 1:28 am
by SteveD
Image

The bush/spacer #16. There are options. Mine currently uses the 13.5mm bush...picture in the first post above.

pn 52 1 236 528 BUSH - 11MM (from 09/80) Spacer tube 11mm, R45 - R100RT.
bush 11mm.jpg
bush 11mm.jpg (20.34 KiB) Viewed 7300 times
pn 46 52 2 301 704 BUSH - 13,5MM (from 09/80) Spacer tube 13.5mm, R45 - R100RT. When installed on the center stand assembly, this bushing is for a high pipe mounting application.
High pipe means what? ST, GS?
Munich in Perth list the 13.5mm at $OZ12.50 each, but not the 11mm.
Motorworks UK list the 11mm @ $OZ8 each but are out of stock.
Motobins describes theirs as 20mm but that the total diameter. Their pn is for the 13.5mm at $OZ6.20

The springs #18 are these, supplied to 2/82
spring to 2.82.jpg
spring to 2.82.jpg (11.38 KiB) Viewed 7300 times

Re: R100RS centre stand repair.

Posted: Sun Feb 16, 2025 3:56 am
by SteveD
Progress :) Not as pretty as Jeff's but tomorrow I'll do my best to tidy them up.

Image Image

Re: R100RS centre stand repair.

Posted: Sun Feb 16, 2025 2:21 pm
by JohnT
I carefully ease the oval holes with a round file until they are round again and make new bush/spacer, number 16, on the lathe to fit.

Re: R100RS centre stand repair.

Posted: Mon Feb 17, 2025 6:30 am
by SteveD
JohnT wrote: Sun Feb 16, 2025 2:21 pm I carefully ease the oval holes with a round file until they are round again and make new bush/spacer, number 16, on the lathe to fit.
Welcommen to the forum. :)
Do you make it 11mm or the 13.5mm? A lathe would be nice. I need to source a 21mm drill bit to redo the holes. They're had some weld to the worn inner diameter.

The bike is elevated and on the side stand to allow trial fitment.

Elevated.jpg
Elevated.jpg (726.04 KiB) Viewed 7172 times
Image

So sort those holes and fit...adjust etc then paint. I'll try and source some 11mm bushes instead of the 13.5 version.
I'll hold back on the shortening of the stand. That'll be stage 2.

Re: R100RS centre stand repair.

Posted: Mon Feb 17, 2025 7:10 am
by JohnT
I don't make the hole a specific diameter, just round, and what ever the hole diameter is I make the bushes to fit.

Re: R100RS centre stand repair.

Posted: Mon Feb 17, 2025 7:32 am
by SteveD
JohnT wrote: Mon Feb 17, 2025 7:10 am I don't make the hole a specific diameter, just round, and what ever the hole diameter is I make the bushes to fit.
The advantage of a lathe and the skills to go with it. I'm envious. The parts fiche offers 2 depths of the spacer...11 and 13.5mm. Do you customize the depth of the one you make?

Re: R100RS centre stand repair.

Posted: Mon Feb 17, 2025 8:54 am
by JohnT
I don't change the depth/length I just copy the ones from the bike but with a larger diameter to suit the new hole diameter.

Re: R100RS centre stand repair.

Posted: Tue Feb 18, 2025 4:20 am
by SteveD
I can't source the 11mm deep version anyhow so I'll likely use some new 13.5mm version. Mine don't look too bad, certainly much better than the previous pair that were in there. I might trim those older ones to 11mm, redo the countersink and see what they're like. They'll need some shimming due to wear but likely only short term just to see if there's any detectable difference. I doubt I'll notice much but I'm interested and time allows the trial.

Re: R100RS centre stand repair.

Posted: Fri Feb 21, 2025 4:01 am
by SteveD
Image Image

$OZ60 for the 20mm drill bit at the hardware shop! I sourced one for $7 from a fb marketplace Chinese hardware importer.
I used a mates whopping big drill press to do the holes. The bush is 20mm diameter when new but mine were a little worn, ~ 19.6mm. So the holes were drilled and the bushes fit with a gentle tap. Too easy.

Now to get it on the bike.