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Discussion Starter #1
I've been looking at the threads on the chrome cap issue. Just done mine but they were well corroded and stuck fast - one came off intact but the other got damaged a bit. It's hard going and needs plenty of patience. What a terrible bit of design!

The reason for the new thread is that I need to source the dust seals that go beneath the chrome caps and above the oil seals. They don't seem to be available anywhere and I am wondering if anyone knows whether they are essential. It seems to me that as long as the rubber boots are kept properly in place and the oils seals are good the dust seals don't really have much of a job to do anyway. Any thoughts/ ideas?
 

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Hi ROTR if it is this dust seal you are talking about Dust-seal,314510 Cb200 England 91254453000 on the listing you can see the numbers 314510 which is probably the size of the seal 31mm internal x 45mm external x 10mm depth. I haven't found an exact match but this one is close 31 x 45 x 7 so might be an option for a replacement 31x45x7mm Nitrile Rubber Rotary Shaft Oil Seal R21 / SC

You should be able to check the measurements to check that my guess is right, good luck.

Irene
 

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Discussion Starter #3
Thanks Irene - that is the one - I'll check it out as I do have one intact but worn old unit to use as a template. I'll post more info. after I've tried it out.
 

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The 10mm depth is probably critical, as (if I remember correctly) the dust seal takes up the gap between the actual oil seal and the circlip which holds it all in place. That missing 3mm might mean that the oil seal 'floats' up and down ?

EDIT - I'm talking rubbish, aren't I ? Dust seal sits on top of the circlip.

DSCF1859.JPG
 

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Discussion Starter #5
Have now done a detailed review and the answer is that the part needed is quite specialised (Richards photograph shows it well) - it is a combination of 3.5mm thick base very similar to an oil seal of approximately 32x44 with a 2mm thick steel washer like element above it of approximately 51mm external diameter and above that a flexible cone shaped boot with internal diameter of approximately 31mm. I can't see how to use off the shelf parts to get the same result but I am going to look into whether I can use modellers materials to fabricate an alternative. If successful, I'll report back but it could take some time!
p.s. In case it matters to anyone, I'll just mention that the circlip shown in Richard's photo is unlike the wire snap rings I've come across in four examples of the standard forks (from 1976 and 1977 CB200 versions) although I'm sure it should work just as well.
 

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My photograph is of my CL175 K7 forks, which I assumed were the same as CB200 forks. Dangerous things, assumptions.

That said, they are NOT the same as CL175 K6 and earlier forks, and CB200 top yoke, fork gaiters, oil seals and top nuts do all fit, hence my assumption.

( I originally bought some CB175 top nuts which were completely wrong. Still sat in my box of bits, if anyone local wants them.)
 

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My photograph is of my CL175 K7 forks, which I assumed were the same as CB200 forks. Dangerous things, assumptions.

That said, they are NOT the same as CL175 K6 and earlier forks, and CB200 top yoke, fork gaiters, oil seals and top nuts do all fit, hence my assumption.

( I originally bought some CB175 top nuts which were completely wrong. Still sat in my box of bits, if anyone local wants them.)
Will they fit a CB200 Richard?
 

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Discussion Starter #8
Just found out that Wemoto have some Slinky dust seals so problem solved.
 

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Discussion Starter #12
Looks like you are busy with all your bikes Irene! The oil seals you have seen are fairly widely available but the dust seals are a bit scarce. My project is moving along slowly as I'm doing everything myself including refurbishing all the minor parts. The original parts are in a pretty sad state and need a lot of work. As I work on one area I'm accumulating the parts I'll need for the next. I'm just starting to work on the steering and front suspension so the forks have not been rebuilt yet. As far as I can see both the dust seals and the oil seals I've sourced are the right fit but it might be a week or two before I can confirm that.

I've been lucky so far in sourcing consumable parts - there are a couple of oils seals I couldn't find (engine and rear wheel) but both originals were in very good condition so I've been able to reuse them. Biggest problem was sourcing a new piston ring - it turned out to be cheaper to buy a new pair of aftermarket pistons from the U.S.!
 

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FYI - just uploaded a few pix to an album to illustrate where I've stared and where I'm going with the build. So far I've only rebuilt the frame, rear end and engine. There's a mass of work to do on the front end, rewiring, tank etc., etc. hence the slow progress.
Here is the current thought on where I think I'm heading for
CB200-75 colour tests 2.jpg
It's not an attempt to get to factory spec. I'm just aiming to learn by doing all the work myself and plan to end up with a solid runner which will be capable of being used for years to come but without compromising the ability of any future owner to return it to full factory spec.
 

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Discussion Starter #14
Right, I've rebuilt the forks today. The dust seals fit O.K. but they are deeper than the originals. There is a small gap above the bottom tubes equivalent to about the thickness of the oil seal snap ring. I'm going to see how things settle down but it looks like a millimetre or so will need to be shaved off the bottom of the dust seals to get a perfect fit. Anyway even as they are, there is a good tight seal between the fork uppers and lowers.

Also maybe of interest - I got a cheapish seal tool from mandp and, although it was not obvious how to use it (no instructions and mandp could not give detailed advice) it didn't take too much working out and it worked pretty well:-

Fork Seal Driver Tool

if anyone needs advice on usage - let me know.
 
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