UK CB77 restoration, here we go...

[adeskey]

Yes, Loudmouse, I will do that. G-Man posted a good graph of the changes and it makes sense.

Let's see if I can include it here...

Why didn't Honda do it ?

[LOUD MOUSE]

Would appear HONDA liked what they had as it was never changed on the production years bikes.
I've changed all the engines I've worked on/rebuilt since 1994. ......................lm

Yes, Loudmouse, I will do that. G-Man posted a good graph of the changes and it makes sense.

Let's see if I can include it here...

Why didn't Honda do it ?

[thepunisher2007]

Hi adeskey,

I'm also doing a restore and happen to be in Norfolk UK. Although mines a CL77 I think there are alot of compatible parts. I have a load of spares and if your in need of anything feel free to give me a shout and ill have a look.

Iv also managed to find a few phone numbers of people and places in the UK to get bits from too.

Mike

[adeskey]

Hi Mike,

Good to hear from you. PM sent.

A

[adeskey]

So here is my method of (hopefully)curing the wear issue with the 18mm bush in the gearbox.

The following pictures show the worn bush next to a new one, the new bush with a stepped shim, and the assembly in place, ish.

It would seem that the bush shoulder wears as there is a very small contact patch with the adjacent shaft, due to the chamfer on the inside of that shaft. Now there isn't any end thrust due to the gearbox operation, so how about the oilway in the bush being helical causes a small axial load due to the oil flowing in it and the rotation imparted from the shaft and gear that it supports. It need only be a small force, but over a high mileage...?

So I've had a stepped washer made up to accept the bush shoulder which doubles as a shim to remove unwanted endfloat in the shaft. The bush shoulder gets a better contact patch and is prevented from contacting the shaft.

Should last forever now....