1961 CB72 Project

G-Man · Post by **G-Man** » Mon Sep 29, 2014 10:39 am

Vince

You'll be the first ( actually the second) to know....

Graham

G-Man · Post by **G-Man** » Tue Sep 30, 2014 11:01 am

A little bit more progress before the fall sets in here. I had to do a little welding on the tail light bracket because part of one license plate bracket had been ground away. Most likely that happened in the incident that got the bike its later forks and wheels. I was able to snip a piece of steel to match the missing section and weld it in place. By the time I'd finished I needed to re-file the bolt hole which had got closed up a little.

Still undecided as what to do with my "chrome" side covers so I pulled a couple of replacements from the spares box and painted them up. Here are the parts in silver base coat. Clear coat will go on when I am back from my next trip, if the weather is OK.

Side Panels by graham.curtis, on Flickr

G

smccrory · Post by **smccrory** » Tue Sep 30, 2014 7:44 pm

G-Man wrote:Most likely that happened in the incident that got the bike its later forks and wheels.

Interesting how restoration can turn into an investigative history pursuit so easily...

G-Man · Post by **G-Man** » Wed Oct 01, 2014 12:26 am

I really enjoy that part. I have the original registration documents for this bike which lists all of the original owners. Just imagine those youngsters ripping around the Lincolnshire lanes in the early '60s....

G

smccrory wrote:
G-Man wrote:Most likely that happened in the incident that got the bike its later forks and wheels.
Interesting how restoration can turn into an investigative history pursuit so easily...

G-Man · Post by **G-Man** » Sat Oct 04, 2014 9:29 am

The weather has been cool and wet today - Ideal for a day in the workshop...

I have had no luck finding a Plate "B" for my steering damper and am quite lucky to have found any of the parts really. The early parts book illustrates the early assembly and virtually everything is different from later models.

Parts book page by graham.curtis, on Flickr

First job was to copy the plate that Alan had lent me. This is made from 2.5 mm plate so I marked one out using the original one as a pattern and sawed out the shape, then finished up with files.

cutting plate by graham.curtis, on Flickr

The centre hole needs to be 30mm to clear the large central nut that secures the assembly.

cutting hole by graham.curtis, on Flickr

On the original plate there is a little lug punched through to stop the spring rotating. I improvised by sawing the 'slot' and brazing in a small lug.

brazing lug by graham.curtis, on Flickr

The plate with the friction material is a modified later version. I had to cut the central hole out to 30mm and will have to open the square boss to accommodate the slightly larger '61 frame lug.

boring damper plate A by graham.curtis, on Flickr

Here is my copy plate next to an original one - right.

Damper Plate "B" by graham.curtis, on Flickr

The early bikes have a six-petal spring which used a smaller nut. A bit more time with the lathe and milling machine and here it is....

damper rod nut by graham.curtis, on Flickr

Here's the early (left) alongside a later version.

Early and Late Springs by graham.curtis, on Flickr

And here is the complete set of parts laid out.

Full set of damper parts by graham.curtis, on Flickr

And lastly - how it all goes together..

assembly.jpg by graham.curtis, on Flickr

G

jensey · Post by **jensey** » Sat Oct 04, 2014 3:43 pm

Hi,

Good work !

Jensen

smccrory · Post by **smccrory** » Sat Oct 04, 2014 4:15 pm

Envious of your fabrication skills!