My New Project arrives after a 44 year wait!

[McCabe-Thiele (Ted)]

Yikes Dave those carbs look like new - I've only just opened up the image.

[AshimotoK0]

Those carbs are amazing Dave. Plus you correctly  yellow chromate passivated the parts .... unlike a lot of the pro carb 'restorers'. A lot of people argue that they were BZP originally but I have seen a NOS set of 400 carbs in their original Honda box and they were definitely yellow passivated. Problem is that components and memories fade 

[McCabe-Thiele (Ted)]

I agree with Ash the Yellow pasivation is brilliant - how did you do the steel carb blanking plugs - presumably you had to remove them?

[AshimotoK0]

I agree with Ash the Yellow pasivation is brilliant - how did you do the steel carb blanking plugs - presumably you had to remove them?

They press out pretty easily Ted.

[McCabe-Thiele (Ted)]

No one seems to have responded to your question about the brake pivot bar thing you are missing.
I can't check my old master cylinder as I gave it to Simon who has since sold his 500.
Bryan might know the answer in the absence of Ken.

[AshimotoK0]

No one seems to have responded to your question about the brake pivot bar thing you are missing.
I can't check my old master cylinder as I gave it to Simon who has since sold his 500.
Bryan might know the answer in the absence of Ken.

If he means the plate that holds in the rubber rebound tube .. I have a used spare one  Dave that you can have.

Or if you want a brand spanking new one https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_45527300000/

The rubber tube replaced the threaded bar with a flat on it and M6 nut that was fitted to the earliest CB750 master cylinders that acted as an adjustable stop.

[Laverda Dave]

Those carbs are amazing Dave. Plus you correctly  yellow chromate passivated the parts .... unlike a lot of the pro carb 'restorers'. A lot of people argue that they were BZP originally but I have seen a NOS set of 400 carbs in their original Honda box and they were definitely yellow passivated. Problem is that components and memories fade 

Thanks for all the positive feedback everyone. It is a nice feeling actually putting things back together instead of taking them apart and finding something else that is worn out or broken!

Ash, I remember a discussion about the carb hardware and the correct finish about a year ago as I found the back of one of the blanking plates still had its yellow passivate finish. I also remember the 'push only' 400/4 at the Silverstone auction having the same finish on all the hardware (I think that is the same bike in your photo as it is a yellow one and you can see just how fast it is standing still ).  The rear brake lever pivot also has yellow passivate finish so I got this done at the same time. I got the new carb felts from Ken and they fitted perfectly.

The brake lever pivot/plate thing ('thing' being a technical term I use to describe something of unknown origin that I know nothing about), yes that's it. What does it actually do?  It isn't sprung, it isn't a switch and it is bolted to the brake lever casting? I also notice it has some kind of bush that goes into a hole in the brake lever casting, what is the bush for? I know the old saying that Honda wouldn't fit anything if they could help it in order to save some cash but I am at a loss trying to think what this part actually does? I cannot find a description anywhere. If you have a spare one can I have it please Ash as it obviously serves a purpose for something brake related?

Dave

[Laverda Dave]

Ahh, I've just re-read your post Ash. It's a rebound bar, hmm...... I still dont understand its exact purpose, was it an early form of adjustable lever reach?

[Bryanj]

Should be rubber forthe lever to bounce against

[Laverda Dave]

Should be rubber forthe lever to bounce against
[/quote

So in effect a 'soft stop' Bryan to prevent a hard metal to metal contact between the lever and body?

[AshimotoK0]

That bit of rubber tube is well expensive for what it is. You need free play at the lever and the rubber stops the lever from vibrating evidently.
Also dealt with here :- http://forums.sohc4.net/index.php?topic=147275.0

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On the early disc braked bikes they used this arrangement to adjust the free play

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[Laverda Dave]

'Reassuringly expensive' as a mate of mine would say

[Laverda Dave]

'Reassuringly expensive' as a mate of mine would say

Good to finally know what it does though, thanks Ash👍

[Cb750r]

Hi I know this is a side track for your thread, but as you have Laverda in your handle you might be have seen this or know where to look.

This is a photo of my friends dad as he helped in the pit crew for this bike in the early 70s in Canada, my friend is trying to track down the bike/current owner.

If you have any suggestions for him it would be appreciated.

[Laverda Dave]

Hi CB.

His best bet is to join the Laverda forum. It is truly international with some very helpful people who will 99% know where that bike is or at least it's history. Laverda race bikes are rare and expensive and they tend to move in specialist circles.
One guy who will probably know more than most is Jean-Louis Olive. He knows all there is to know about Laverda race bikes and their development. He has written some fantastic books on the subject and is on the forum. Another guy is Manix who used to race them and also on the site. The site is actually Canadian run I believe.
Good luck with tracing it, if it's still around it will be worth a few bob as we say in blighty 👍
Dave