1961 CB72 Project

Steverino · Post by **Steverino** » Sat Apr 25, 2015 3:14 pm

That's a pretty impressive set of front rotors. Everything else too.

G-Man · Post by **G-Man** » Sun Apr 26, 2015 2:33 am

Steve

I've watched the project develop over the last few years and it looks pretty complete now. Not sure if it has run yet but I imagine the sound will be somerthing special.

G

G-Man · Post by **G-Man** » Sun Apr 26, 2015 2:38 am

Mike

Yes I remember you mentioning the chain but I'd forgotten who was doing it. Interesting about the Messerchmitt. Perhaps it was recorded in Mr Honda's little notebook after his trip to Europe in the 1950s

There was a CB77 for sale on one of the stalls outside but it looked like it had been thrown together.

G

SMBH wrote:I was at Satfford show to day saturday and had a chat to Jeff Dale on the Honda racing motorcycle stand he has a CB77 race kitted on his stand he has a web page hondale.co.uk, I was talking about the Honda primary chain and he tells me the Messerchmitt 3 wheeler use the same chain. I had same chain from Sprockets Unlimited and have done some 500 miles with no problem.
Good find that speedo, not much stuff for CB72/77 there today.
But a good show.

G-Man · Post by **G-Man** » Sun Apr 26, 2015 12:47 pm

The clutch on this '61 bike was in a bit of a state and I spent quite a while cleaning it up. Strangely, it was the one part inside the engine that had succumbed to corrosion. All of the steel plates were very rusty and the fibre plates looked qute a mess even after a good scrub and a session in the ultrasonic bath.

In the end I pulled the complete clutch off a spare 1963 motor and started all over again. That was a much better prospect and had the additional benefit of the cush drive basket. I agonised about the 'non-originality' but decided it was better to begin with a decent clutch.

I decided also to use the sprocket and chain from the '63 engine as they were in fine shape.

The lifter mechanism and clutch centre went on next retained by the snap-ring.

I used a set of fresh friction plates of the later style on the aluminum core.

The springs from the original clutch which had been used with a 350 kit were pretty light but had been given some 'preload' spacers in the form of some thick spring washers. I decided to use the ones from the '63 motor instead, although I might regret the heavy lever action later.....

Just as I got the pressure plate tightened down I noticed that I had left out the gear shifter shaft. It all had to come back apart again. I decided that "travel weariness" had set in so I packed up for the evening.

To be continued...... :-)

G

Steverino · Post by **Steverino** » Sun Apr 26, 2015 1:22 pm

Your posts always provide a learning experience for me. I am looking forward to seeing your approach to the shifter shaft seal. Including your source for the seal.
Steve

LOUD MOUSE · Post by **LOUD MOUSE** » Sun Apr 26, 2015 1:43 pm

What CUSH drive basket G?. ...........lm

G-Man wrote:The clutch on this '61 bike was in a bit of a state and I spent quite a while cleaning it up. Strangely, it was the one part inside the engine that had succumbed to corrosion. All of the steel plates were very rusty and the fibre plates looked qute a mess even after a good scrub and a session in the ultrasonic bath.

In the end I pulled the complete clutch off a spare 1963 motor and started all over again. That was a much better prospect and had the additional benefit of the cush drive basket. I agonised about the 'non-originality' but decided it was better to begin with a decent clutch.

I decided also to use the sprocket and chain from the '63 engine as they were in fine shape.

The lifter mechanism and clutch centre went on next retained by the snap-ring.

I used a set of fresh friction plates of the later style on the aluminum core.

The springs from the original clutch which had been used with a 350 kit were pretty light but had been given some 'preload' spacers in the form of some thick spring washers. I decided to used the once from the '63 motor instead, although I might regret the heavy lever action later.....

Just as I got the pressure plate tightened down I noticed that I had left out the gear shifter shaft. It all had to come back apart again. I decided that "travel weariness" had set in so I packed up for the evening.

To be continued...... :-)

G

G-Man · Post by **G-Man** » Sun Apr 26, 2015 2:16 pm

Steve

What issue do you have with that seal? I usually wrap the spline with tape before sliding the case over it.

My seals just come from a bearing stockist, using the sizes in the Honda manual.

http://simplybearings.co.uk/shop/Seals- ... index.html

G

Steverino wrote:Your posts always provide a learning experience for me. I am looking forward to seeing your approach to the shifter shaft seal. Including your source for the seal.
Steve