1961 CB72 Project

G-Man · Post by **G-Man** » Sun Apr 03, 2016 11:27 pm

HaHa!

LM & Seadog - I still have a small 'miscellaneous pile' of bits that I could use to build one or two more but this is the one I use to test LM's excellent idea with the primary wheel. It deserves to be finished off,,,,,, :-)

G

LOUD MOUSE wrote:I agree.
And he will show us how. ...................lm

Seadog wrote:
LOUD MOUSE wrote:I can supply that part many times so no real reason the fix a crack. ............................lm

Seadog wrote:How will you repair that crack, G?
LOL, I might be wrong, but I somehow think that G will want to fix it just because it would be a challenge. He certainly doesn't need another chain tensioner....

G-Man · Post by **G-Man** » Sat Apr 23, 2016 11:54 am

Well, several weeks have passed by and not much restoration work to show for it. I did manage a trip to the Prescott Hill climb last week and saw Allen Millyard'sfleet of specials from 8-litre Dodge Viper powered megabike down to his gem-like 100cc V-twins based on Honda SS50s.

This week it was a trip to the Stafford International Classic Bike show where ther is always plenty to look at and to listen to.

Alan_W left a pair of 1961 wheel spindles with a friend as he was helping his son go racing at Brands Hatch.

These early ones are hollow. The rear all the way through to the cotter-pin holes at the threaded end and the front to about 60% through. The rear is incredibly light. Honda really did intend to make the CB72 light and sporty when it was introduced. Alloy shock covers, thin gauge or aluminum fenders and the drilled spindles. Obviously not really cost-effective it is, nevertheless interesting to see the thinking. They could have save that weight and more with alloy rims but they were trying to think of everything they could.....

Alan also left me an example of his variation on my cam chain tensioner wheel modification. This looks pretty neat.

I was also able to get hold of another gear for my CYB 5-speed puzzle, thanks to Dennis Murfin and Jeff Dale. This is the 2nd gear (countershaft) so I think I am only short of one gear, the forks and drum now. You never know - I might have the whole set in another 5 years.

There wasn't much other Honda stuff to be had but I did pick up this dividing head for my Myford lathe. This is used for very accurate angular spacing of machining operations for things like gears and bolted rings where accurate 'dividing' is essential. It's one of these things that you just have to buy when one turns up........

G

G-Man · Post by **G-Man** » Sun May 15, 2016 3:37 pm

Well, my excuse is that I have been away with work for some time so another month goes by with no substantial work done.

I was able to pick up some parts from my friend who 'looks after' my US eBay purchases. I was particularly pleased to get the NOS steering damper parts and recessed fork top nuts. Although it looks the same the earlier friction plate is dimensionally different, having a bigger hole in teh middle and a larger square cutout to fit over a larget lug on the frame.

Many thanks to Dick Eastman who let me have his surplus muffler brackets. These along with the ignition switch bracket I got from my friend, Terry, will go on my 1962 CB72 frame.

I did do a little bit of work on some cam chain tensioners that LM sent me. The primary chain tensioner rollers can be re-purposed as cam chain tensioner wheels as both are the same diameter. The center rib needs thinning bit that is easy enough. I got all the parts dismantled and cleaned but the rest will have to wait as I am away for most of the week.

Looking forward to some quality time in the workshop when I can fit that in.

G

LOUD MOUSE · Post by **LOUD MOUSE** » Mon May 16, 2016 11:01 am

No rush with my parts "G". ..................lm

G-Man wrote:Well, my excuse is that I have been away with work for some time so another month goes by with no substantial work done.

I was able to pick up some parts from my friend who 'looks after' my US eBay purchases. I was particularly pleased to get the NOS steering damper parts and recessed fork top nuts. Although it looks the same the earlier friction plate is dimensionally different, having a bigger hole in teh middle and a larger square cutout to fit over a larget lug on the frame.

Many thanks to Dick Eastman who let me have his surplus muffler brackets. These along with the ignition switch bracket I got from my friend, Terry, will go on my 1962 CB72 frame.

I did do a little bit of work on some cam chain tensioners that LM sent me. The primary chain tensioner rollers can be re-purposed as cam chain tensioner wheels as both are the same diameter. The center rib needs thinning bit that is easy enough. I got all the parts dismantled and cleaned but the rest will have to wait as I am away for most of the week.

Looking forward to some quality time in the workshop when I can fit that in.

G

G-Man · Post by **G-Man** » Mon May 16, 2016 2:29 pm

LM - They'll be done for my next trip, in a month or so.

G

LOUD MOUSE wrote:No rush with my parts "G". ..................lm

G-Man wrote:Well, my excuse is that I have been away with work for some time so another month goes by with no substantial work done.

I was able to pick up some parts from my friend who 'looks after' my US eBay purchases. I was particularly pleased to get the NOS steering damper parts and recessed fork top nuts. Although it looks the same the earlier friction plate is dimensionally different, having a bigger hole in teh middle and a larger square cutout to fit over a larget lug on the frame.

Many thanks to Dick Eastman who let me have his surplus muffler brackets. These along with the ignition switch bracket I got from my friend, Terry, will go on my 1962 CB72 frame.

I did do a little bit of work on some cam chain tensioners that LM sent me. The primary chain tensioner rollers can be re-purposed as cam chain tensioner wheels as both are the same diameter. The center rib needs thinning bit that is easy enough. I got all the parts dismantled and cleaned but the rest will have to wait as I am away for most of the week.

Looking forward to some quality time in the workshop when I can fit that in.

G

LOUD MOUSE · Post by **LOUD MOUSE** » Thu May 19, 2016 4:59 pm

Thanks "G". ...............lm

G-Man wrote:LM - They'll be done for my next trip, in a month or so.

G

LOUD MOUSE wrote:No rush with my parts "G". ..................lm

G-Man wrote:Well, my excuse is that I have been away with work for some time so another month goes by with no substantial work done.

I was able to pick up some parts from my friend who 'looks after' my US eBay purchases. I was particularly pleased to get the NOS steering damper parts and recessed fork top nuts. Although it looks the same the earlier friction plate is dimensionally different, having a bigger hole in teh middle and a larger square cutout to fit over a larget lug on the frame.

Many thanks to Dick Eastman who let me have his surplus muffler brackets. These along with the ignition switch bracket I got from my friend, Terry, will go on my 1962 CB72 frame.

I did do a little bit of work on some cam chain tensioners that LM sent me. The primary chain tensioner rollers can be re-purposed as cam chain tensioner wheels as both are the same diameter. The center rib needs thinning bit that is easy enough. I got all the parts dismantled and cleaned but the rest will have to wait as I am away for most of the week.

Looking forward to some quality time in the workshop when I can fit that in.

G

G-Man · Post by **G-Man** » Mon May 23, 2016 2:22 am

At last! A little bit of 'me' time in the workshop. My last free weekend was spent gardening, getting a neighbour's tractor running and repairing a lawnmower.

I knew that I had the 'correct' early style primary cover for this bike, but when I dragged it out and started cleaning it up, there were a few nasty gouges and defects. The joint face was a bit horrible so I gave the high-spots some treatment with a long flat file. Infortunately there were a couple of places where metal had been damaged and 'flatting' on wet-or dry paper wasn't going to fix it.

Along with the damage to the clutch oil feed gallery and the underside of the gear-shift boss - it was time to break out the 'Techno-Weld' aluminum solder.

All damage was cleaned with my mini 2" grinder and then the cover was heated with an insulated blanket to keep the heat in. The 'weld' material is melted against the hot aluminum where it melts on contact. A little stainless steel wire abrader is used to break the oxide layer and allow the two materials to bond.

I was able to grind off the excess with the grinder and get the cover ready for wet sanding to smooth out the grinding marks.

A couple of marks in the joint face were filled in the same way and it was ready to sand and prep the cover for paint.

It was a nice warm day so I was able to get some paint on this and the kickstarter cover. I had to fill a few more blemishes but we are almost there with the final pieces for the engine.

When these two are complete, I am looking forward to getting the hubs finished and getting them into the rims.

Slow progress is better than no progress.... :-)

Just a quick reminder of how it all started....

G