restoration of a dutch honda cb72

[lix]

Today I removed the cilinders:

Pistons need to be changed en cilinders bored:


P1000674 by Kristof Beheyt, on Flickr


P1000681 by Kristof Beheyt, on Flickr

The sprocket where the primaire chain leads to is in bad shape and need to be replaced :(

I gues this is de primairy sprocket, partnr: 13611-259 010 or am I wrong?


P1000683 by Kristof Beheyt, on Flickr

In the meanwhile started polishing some things:


P1000664 by Kristof Beheyt, on Flickr

regards, Kristof

[rrietman]

K; I have never seen a primary chain with a break like that, probably someone had a tool on it. those chains are really tough to get new, I think there is an asian vendor selling them, but that's it. good used will work well. I am not familiar with "ice blasting" but I like the idea.
Randy

[jensen]

Hi Kristof,

As promised in our telephone conversation I can deliver a nice primary chain and a primary sprocket. Please measure the diameter of your clutch sprocket as well. We talked about chain wear, please read the thread "Primary chain rub on top bolt hole boss of left outer cover" in the section "Motors - 247cc & 305cc | 337cc & 350cc" carefully and please share your measurements on this thread.

Please open up your oil pump and "read" the inner gears, and compare them with the specs. Like Loudmouse says, these particles are somewhere in your engine and could be gone through the pump.

@ rrietman : I saw a few of these damages in engines I opened up, even completely broken ones.

Then : available modern oil seals (at eriks) :

Please go for modern stuff, even if you are not using a synthetic oil, the patrol contains at least 5% ethanol, and modern oil seals can handle that, the old ones (NOS) not. Oil will contain ethanol residues after riding longer times, so be wise.

shift shaft / kick starter p/n : 91202250000 size (ID-OD-TH) : 14-25-7 p/n eriks : 10005836 / 10008718 material : NBR
drive shaft p/n : 91203259000 size (ID-OD-TH) : 30-62-8 p/n eriks : 10006003 material : NBR
point shaft p/n : 91204259000 size (ID-OD-TH) : 16-28-7 p/n eriks : 10005857 material : NBR
crank shaft seal p/n : 91201259000 size (ID-OD-TH) : 32-65-7.5 p/n eriks : not for sale (only 10 mm thick) material :
shift drum p/n : 91201200000 (91201283000) size (ID-OD-TH) : 12-25-4.5 p/n eriks : not for sale (only 5 mm thick) material :
clutch adjuster p/n : 91205200000 size (ID-OD-TH) : 22-26-29.8 p/n eriks : not for sale material :
clutch rod p/n : 91205259000 size (ID-OD-TH) : 8-21-6 p/n eriks : 1005190 material : NBR
starter sprocket p/n : 91208259000 size (ID-OD-TH) : 20-30-5 p/n eriks : 1006423 material : NBR

Like I said in the mail before you bought this bike, please be aware of the costs involved in this resto, and hurrying isn't going to make it cheaper either,

Jensen

[lix]

Thanks Jensen,

As soon as I get the measurements I will post them. I didn't know you have the primary sprocket as wel :)!

What do you mean with 'at eriks'?

I've send you a Pm!

regards, Kristof

[jensen]

Hi Kristof,

Eriks is a company : http://eriks.nl/nl/producten-en-dienste ... /o-ringen/

But when you google a bit, you'll find more,

When using a nice used chain, it's better to use it as a original set, sprocket and chain, then they wear less, just like any other chain sprocket combination. The clutch sprocket is a different matter, as the amount of teeth is much lower, so less significant.

Jensen

[lix]

Jensen,

This morning I measured the primary chain. Below is a picture. Have I done this correct?

As you can see it was about 25.44mm....


P1000685 by Kristof Beheyt, on Flickr

I removed the oilpump as well but didn't had the time to open it.


P1000687 by Kristof Beheyt, on Flickr

greets

[jensen]

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