Honda 4-takt forum

Hello from France !
I am sorry to have to speak in English as I don't speak your language, I can also speak French if you prefer, just tell me.
I didn't found the part of the forum where I can make a presentation, if you can help me ?

I am restoring a CF50 1967, that's was the name used in France for the well-known C320, with engine C321. I have a problem with the front fork, is it the right place for asking some help and post pictures ?

Thanks

Welcome,

You can make your presentation right here.

OK, thanks, so I am Patrick, living in Lyon (France), now retired and restoring my Honda bikes from the 60's and 70's. I have a website (http://www.honda60-70s.net) and I am administrator of a forum dedicated to these bikes : http://www.cb500four.com

Forum's members and I are more and more interested by 50cc Honda of the era and I found last year a CF50 1967, 1 owner since new and 14 000 original kilometres. Here is a picture of the bike with its 1st owner :




The CF50 is a mystery for us as it is in fact a C320S (C321 ?) made in Alost. Why and who has chosen this name for the French market ? Very strange as Honda Japan will use this "CF50 type" some years later for the Chaly !

I had a problem to remove the chromed tube on the front fork, on the parts-list this part seemed to be threaded with lugs for unscrewing it :




No lugs and very hard to move this part on my fork :




Luckily I found the solution today with the help of a lot of WD40 and after heating the tube :






I am now searching for some parts, it seems to be very hard to find gasket sets for this C321 engine ?
Do you know where I can find these with good quality ?

Thanks in advance for your help

http://www.4taktwinkel.nl/website/index ... yWord=c321

http://www.leertouwer.com/default.asp?i ... doorzoeken

https://www.cmsnl.com/honda-c320_model7862/

http://www.viertaktschuur.nl/?s=c320&s_cs=true

Gr. Wim.

gaskets, you can still get at the above standing addresses.

the chrome buses on the fork that are going to be very hard to get.

Thanks, I knew these website but CMS has nothing about gaskets, 4taktwinkel and viertaktschuur has very few gaskets, leertouwer has the most complete set : http://www.leertouwer.com/default.asp?i ... doorzoeken.
Do you know if the quality of this set is OK, I generally use only Vesrah or Noboru gasket set ?

An other question : is there a screw at the bottom of the fork legs in the aim to dismantle them ?

The quality of parts from leertouwer is almost always oke.

No there is no screw because then you should see it on the drawing.
I think you should do something with part 8, 18 and maybe 10.
Do you have screw 24 already out?

Gr. Wim.

Thanks wim, unfortunately the parts-list is showing the 1st model of front fork, the model fitted on CF50 seems to be the same than the one fitted on SS50 1966, 1st model sold in France in the same time than the CF50.

After heating at 120°C + 2 days with a lot of WD40, the 2nd chrome tube is quite easily dismantled :




After cleaning, the bottom cases seem near perfect but there are lot of scratch and rusted points, so they will be sandblasted and painted new :




After exam I see that the chrome tubes were glued on the bottom cases :








These bottom cases are very different from those on the parts-list, this is a picture from CMS parts-list of a C320 original bottom case with the thread at the top for fixing the chrome tube :




The fork type fitted to the CF50 is, I think, very near from the S90 or the SS50 1° model, sold in 1966.On the SS50 CMS parts-list, I don't see how to dismantle the pipes : https://images.cmsnl.com/img/partslists ... 1_3dd9.gif

And I don't see too on these parts-list these screws under the bottom cases :






If somebody knows how to dismantle these pipes !

Indeed you have the later type front fork which has not the screw bushes.
Why would you want to lossen the screw at the bottom?
If you dismantled the pipes from the cases that is all you need to do for a revision.
I think the screws are fitted for the die casting of the aluminium and do nothing.
Just clean the aluminium fork parts and paint them.
So to see are the pipes in good condition so new oil seals and reassemble the parts again.

All types from the C320 (TS50DX has only thicker pipes) are the same and normally they are in such better
condition then for example SS50 because of the chrome covers.
The rear suspension is mostly more of a challenge becasue they are weak and mostly all have oil leakage.

Suc6

Klaas schreef:Indeed you have the later type front fork which has not the screw bushes.
Why would you want to lossen the screw at the bottom?
If you dismantled the pipes from the cases that is all you need to do for a revision.
I think the screws are fitted for the die casting of the aluminium and do nothing.
Just clean the aluminium fork parts and paint them.
So to see are the pipes in good condition so new oil seals and reassemble the parts again.

All types from the C320 (TS50DX has only thicker pipes) are the same and normally they are in such better
condition then for example SS50 because of the chrome covers.
The rear suspension is mostly more of a challenge becasue they are weak and mostly all have oil leakage.

Suc6

Hij vraagt zich juist af hoe hij de binnen vorkpoten uit de buiten vorkpoten krijgt.

Gr. Wim.

On big Honda bikes (250 to 750) of the era, the Allen screws under the bottom cases have to be unscrewed to dismantle the pipes.

This is not the case with this CF50 fork, a friend of my forum said that on his CG125 the pipes are maintained only by the circlip and the oil seal, you have to beat down the case from the pipe in the aim to extract the oil seal and the pipe !

I tried like this but no result, but I dare not shoot too hard !

I want to dismantle the pipes from the cases in the aim to fit new oil seals

Ah. Well indeed just like a lot of types there is a circlip you have to remove and really hit hard.
The older the seal the nastier he gets loose.
But i don't think the seals have to be renewed or did there leak oil?
If the pipes are rusted and damaged normally you have to change the seals, but these look in good condition.
Does your fork have circlips burried under the grease?
Also look for the diameter from the pipes to buy the corrrect ones.
I had once has a fork where the pipes where 2mm thicker. Probably from a S90 or somewhat type.

Thanks Klaas, so you confirm it is the right method for dismantling the pipes ?
Just remove the circlip and hit hard ?

The oil seals are 50 years old and they leak a little oil. The pipes are in good condition, the measurements are within the tolerances.

Stunningly the rear shocks are perfect, no leaks !

Or the rear shocks are already empty. (after 50 years)

Gr. Wim.

I always put the aluminium part in the bank screw (with protective beaks)
and jank on the pipe. Sometimes you fall behind if it gets loose , but always works.