Page 7 of 11

Re: Cota 172 Restoration

Posted: Sat Sep 30, 2017 10:44 am
by TerrY
There is a company in Brisbane ( Yeerongpilly) called RAD Shock Absorber Repairs that repairs shock absorbers. Contact them and maybe send the photos. Rod there would advise on possibility of repair and costs. Hope this helps.

Re: Cota 172 Restoration

Posted: Fri Oct 13, 2017 9:20 pm
by Phil 850
Got my front fork legs back from Alderton Motorcycle Repairs.
Now there as "straight as a die". Very pleased.

The next step is that the top bush (assuming there is a bush) is worn and the sliders wobble back and forth.
Does anyone know if the is a seperate bush and how to replace it.

Re: Cota 172 Restoration

Posted: Fri Oct 13, 2017 10:32 pm
by David Lahey
There is no separate bush. What you have is 1970s technology.
Options are:
To have the top end of the sliders machined and sleeves fitted to take it back to suit the standard tubes.
To have the tubes re-chromed oversize and the sliders machined to suit.
To find a set of tubes that are a bit bigger diameter and have the sliders (and maybe the triple clamps too depending on how much bigger the tubes are) machined to suit.

Re: Cota 172 Restoration

Posted: Fri Oct 13, 2017 10:59 pm
by David Lahey
I looked back to 18 months ago in this topic and see that your tubes are 31.75mm diameter. Your sliders may be able to be machined out suit 34 mm tubes (2.25mm oversize) which are a very common size fork tube. This is TY250 tube diameter.
I haven't looked but maybe 32 or 33 mm tubes are also easily available.

Re: Cota 172 Restoration

Posted: Sat Nov 04, 2017 2:58 pm
by Phil 850
I finally got the swing arm back together. If you have the rubber pivot type like mine, do not pull it apart unless it is totally stuffed.
It was a nightmare to reassemble. :cry:
But now it is back in the frame :D
IMG_3660.JPG
IMG_3660.JPG (109.18 KiB) Viewed 7565 times

Re: Cota 172 Restoration

Posted: Sun Nov 05, 2017 1:34 pm
by Phil 850
Today I fitted the new rear guard. Problem is, it prevents the tank/seat base from sitting down on the frame.
IMG_3664.JPG
IMG_3664.JPG (99.82 KiB) Viewed 7393 times

Looks like it fits OK here

IMG_3665.JPG
IMG_3665.JPG (72.53 KiB) Viewed 7393 times

With the seat in place
IMG_3666.JPG
IMG_3666.JPG (74.56 KiB) Viewed 7393 times

This is how night the seat is held up by the mud guard.

Does the mud guard need to be reshaped to allow the seat to fit correctly.

Re: Cota 172 Restoration

Posted: Sun Nov 05, 2017 7:41 pm
by Phil 850
On further investigation my frame measures up the same as in the photo below.
There are two dimensions for the position of the rear mudguard support hoop in brackets.
My frame measures the same as the 161 horizontal dimension but measures almost the same as the vertical dimension in brackets (439).
Does this mean that the mudguard support hoop is bent up and needs to be bent down.
I positioned the mudguard as if the hoop was bent down as per the 406 dimension and the rear wheel on full suspension compression just fits inside the mudguard, so I think this would be OK.
What do you all think ?
IMG_3657.JPG
IMG_3657.JPG (90.56 KiB) Viewed 7364 times

Re: Cota 172 Restoration

Posted: Sun Nov 05, 2017 9:41 pm
by Phil 850
Well I have done some research, and while I had asked Vallmoto to quote parts for a Montessa Cota 172, it looks like I was quoted mudguards for a Cota 123.
Am I correct in assuming that because the 123 has smaller wheels than a Cota 172, the mudguards are smaller as well :(

Re: Cota 172 Restoration

Posted: Sun Nov 05, 2017 9:55 pm
by David Lahey
In the photos it looks to me like the rear loop is bent upwards just behind the upper shock mounts

Re: Cota 172 Restoration

Posted: Mon Nov 06, 2017 8:50 pm
by Phil 850
That's what I was starting to think as well David, but then I held the front mudguard onto the front tyre and the mudguard is a smaller radius than the tyre :shock: .
I have had a close look at some photos of 123's compared to 172's, and the 172 mudguards certainly look to be larger radius.
https://nacho247.blogspot.com.au/2016/1 ... rigen.html
Scroll to the bottom of the link and you can see the difference between the 123 & the 172, or is it my imagination :lol: