1961 CB72 Project

jensey · Post by **jensey** » Sun Oct 05, 2014 9:29 am

Hi Graham,

Yes, aluminium it is, but I don't know if it's original Honda or after market.
Tail light is standard for early CB's here, added another picture from the rear.

Square bowl's, with power jets, they're clean in the picture, because I cleaned the carbs for a quick run test. It ran, no strange noises, but the engine needs more then a little TLC.

I don't want to interfere in your build, so this is the last post, sorry for interrupting your thread.

G-Man · Post by **G-Man** » Sun Oct 05, 2014 10:56 am

Jensen

You can interrupt my thread any time! :-) Those pictures are really interesting. My bike has the same rear light and bracket as yours. Alan has the filters for the Power Jet carbs but my bike had no filters at all. It survived for 40 years in the wet on open bell mouths and the engine was perfect inside....

It's good to share knowledge and you have plenty of it on these early bikes. Alan and I have been discussing what footrest rubbers should be on these bikes. Mine is frame number 969 and Alan's is a little earlier, from memory. We have both picked up some repro rubbers from Clauss studios. The ones with circular ribs. We're not totally sure if these are correct.

http://www.ebay.com/itm/Honda-CB72-1960 ... 1304262427

My bike had these fitted but they look more like CB92 rubbers to me.

CB72 Right footrest Rubber by graham.curtis, on Flickr

I am also unsure about the gear shift rubber. I have some of the early ones which match the later style footrest rubbers.

G

G-Man · Post by **G-Man** » Sun Oct 05, 2014 11:02 am

Jensen

Just one more question. Have you seen the early spring clip style air filter hose connectors anywhere? I have some for the Dream but they are too large for the CB72.

http://www.cmsnl.com/honda-cb72-general ... ml#results

G

G-Man · Post by **G-Man** » Sun Oct 05, 2014 1:15 pm

A little bit more progress. Both front fenders need work but the rear is in most need of attention.

mudguards by graham.curtis, on Flickr

The front mount of the rear fender needed a lot of work to get it back into shape, requiring a couple of extra holes and several cracks repairing. The metal is very thin so takes a lot of care to avoid making more holes and distorting the metal.

front mount damage by graham.curtis, on Flickr

After a lot of work with the welding torch, eventually, I was able to get some filler on to smooth the surface and then get a coat of etch primer on. It was getting dark by the time I took these pictures but I felt that it was a good day at the office....

rear mudguard primed by graham.curtis, on Flickr

front mount repaired by graham.curtis, on Flickr

G

G-Man · Post by **G-Man** » Mon Oct 06, 2014 12:46 am

Managed to pick up an early speedo on eBay . The one on the bike doesn't look too awful but I thought it would be handy to have a spare.

61 speedo - front by graham.curtis, on Flickr

The early speedo dial has no high beam indicator between the 12 and 120 on the dial. Also there is no makers's mark at the bottom of the dial like later instruments.

The other difference is on the underside. There is a little tab between the speedo and tacho cable bosses. The spring that holds the speedo in the headlamp shell attached to the little lug. There are no retaining screws.

61 speedo - rear by graham.curtis, on Flickr

G

R100 · Post by **R100** » Mon Oct 06, 2014 8:05 am

On later speedos where the spring was eliminated, what holds the speedo in place?
Mine is very insecure just sitting in the foam collar.

G-Man wrote:Managed to pick up an early speedo on eBay . Th done on the bike doesn't look too awful but I thought it would be handy to have a spare.

61 speedo - front by graham.curtis, on Flickr

The early speedo dial has no high beam indicator between the 12 and 120 on the dial. Also there is no makers's mark at the bottom of the dial like later instruments.

The other difference is on the underside. There is a little tab between the speedo and tacho cable bosses. The spring that holds the speedo in the headlamp shell attached to the little lug. There are no retaining screws.

61 speedo - rear by graham.curtis, on Flickr

G

G-Man · Post by **G-Man** » Mon Oct 06, 2014 9:40 am

R100

Depends which year your bike is. On post '63 Bikes there are two screws in the headlamp bucket which screw into two tapped holes in just below the speedo bezel.

On the 1962 type the screws go through the side of the aluminum speedo hoop on the top triple clamp.

G