restoration of a dutch honda cb72

lix · Post by **lix** » Tue Nov 01, 2011 1:10 pm

jensen wrote:Hi,

No incorrect, please take a good look at the pictures I provided in the mentioned link.
The measured distance is between the bottom of both sprockets (clutch and crank sprocket).

Jensen

Now I see, I first have to take both sprockets off. First I have to find the tool to remove the cranckcasenut. If I find someone to lend it out I will post the info.
In the meanwhile I have opened the oilpump. What do I have to measure or look at if it's still good?

P1000694 by Kristof Beheyt, on Flickr

P1000695 by Kristof Beheyt, on Flickr

P1000696 by Kristof Beheyt, on Flickr

jensen · Post by **jensen** » Wed Nov 02, 2011 3:09 am

Hi,

Before I go further, please read this carefully : http://forums.sohc4.net/index.php?topic=65233.25
It's not a CB72 pump, but the basics are the same. Look especially to the damaged rotor, and look for the same issue's on your gears and housing. I will take pictures of good and bad gears and oil pump housings and display them here later on.

btw, it won't harm to read the whole thread in the given link. Many issue's displayed there are for bikes in general the same.

Jensen

lix · Post by **lix** » Wed Nov 02, 2011 3:58 am

jensen wrote:Hi,

Before I go further, please read this carefully : http://forums.sohc4.net/index.php?topic=65233.25
It's not a CB72 pump, but the basics are the same. Look especially to the damaged rotor, and look for the same issue's on your gears and housing. I will take pictures of good and bad gears and oil pump housings and display them here later on.

btw, it won't harm to read the whole thread in the given link. Many issue's displayed there are for bikes in general the same.

Jensen

Many thanks!

lix · Post by **lix** » Wed Nov 09, 2011 7:24 am

Yesterday I had some time to work on the cb72. Because the nut on the crankshaft isn't off yet I cleaned the carbs in an ultrawavebad. While cleaning I saw there is a spring missing behind one of the two adjusting screws (don't know the name in english).

Before Cleaning:

P1000710 by Kristof Beheyt, on Flickr

After:

P1000719 by Kristof Beheyt, on Flickr

P1000729 by Kristof Beheyt, on Flickr

Also did some polishing

Before:

P1000689 by Kristof Beheyt, on Flickr

After sanding: grain 200, 400,600,1000,1200

P1000690 by Kristof Beheyt, on Flickr

Polished :), the scratshes are not so visible in real.

P1000691 by Kristof Beheyt, on Flickr

@ Jensen: The crankshaftnut came off this morning so I will let you know the measurements as soon as posible.

greets, Kristof

lix · Post by **lix** » Wed Nov 09, 2011 2:23 pm

So I removed the clutch today:

I measured the springs:

35.53, 35.63, 35.67, 35.70 mm --> I will instal new ones.

The primary chain has a play of 20.83mm between the sprockets. Not so bad but I have to instal a new one because it's broken.

Then I looked at the friction discs. In bill Silvers manual he says that the frictions discs should be at least 2.5mm thick. I measured 3.83mm for the total thickness. I guess I did it wrong? Or is it the black stuff on the friction disc that should be 2.5mm?

P1000734 by Kristof Beheyt, on Flickr

LOUD MOUSE · Post by **LOUD MOUSE** » Wed Nov 09, 2011 8:12 pm

HONDA issued at least 4 disc of 4 different thickness. ..................lm

lix wrote:So I removed the clutch today:

I measured the springs:

35.53, 35.63, 35.67, 35.70 mm --> I will instal new ones.

The primary chain has a play of 20.83mm between the sprockets. No so bad but I have to instal a new one because it's broken.

Then I looked at the friction discs. In bill Silvers manual he says that the frictions discs should be at least 2.5mm thick. I measured 3.83mm for the total thickness. I guess I did it wrong? Or is it the black stuff on the friction disc that should be 2.5mm?

P1000734 by Kristof Beheyt, on Flickr

lix · Post by **lix** » Thu Nov 10, 2011 5:20 am

LOUD MOUSE wrote:HONDA issued at least 4 disc of 4 different thickness. ..................lm

Is there any possibilty to know how much wear they may have?