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Front Fork Cir-Clips

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Mr_Sheene:
It's always dangerous to give an old fool too much information. Now I'm confused, especially as I've had time to think. Were Honda running two fork systems in parallel or is this diversity due to their famous continuous development? My bike is March 1970 and starts 1029***, so if there was a change in production, do we know when it took place? Giving the old fool time to think resulted in me wondering if there is also two sizes of fork seal? I've only seen one on DSS and Yamiya but there again, I was only looking for one. I'll measure the old clips tomorrow and may even go beyond my pay-scale and try to publish them. Thanks for the help and advice, I own a bench grinder, so it could get really dangerous!

AshimotoK0:

--- Quote from: Mr_Sheene on June 18, 2019, 10:51:54 PM ---It's always dangerous to give an old fool too much information. Now I'm confused, especially as I've had time to think. Were Honda running two fork systems in parallel or is this diversity due to their famous continuous development? My bike is March 1970 and starts 1029***, so if there was a change in production, do we know when it took place? Giving the old fool time to think resulted in me wondering if there is also two sizes of fork seal? I've only seen one on DSS and Yamiya but there again, I was only looking for one. I'll measure the old clips tomorrow and may even go beyond my pay-scale and try to publish them. Thanks for the help and advice, I own a bench grinder, so it could get really dangerous!

--- End quote ---

I used a really posh surface grinder at work to reduce the thickness ..I personally wouldn't recommend doing it with an angle grinder or bench grinder. It was in desperation really that I did that .. I think all K0's had that smaller clip..  they also had a back-up ring up to 1039120  which is bl**dy hard to find but later fork seals eliminate it's use, as they are thicker.

The numbers are here (from Parts Book in my 750 mega dropbox files  ;)  )

The 47 mm circlips were CB450K1 parts (292)  then later CB450K3/K4 parts (319).

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AshimotoK0:
Here (292 part)  ..but postage a bit steep but maybe he has other items you need.

 https://www.ebay.co.uk/itm/Honda-CL-450-Clip-Sicherungsring-Seegering-47mm-Gabel-Original-NOS/361864727266?epid=1614113344&hash=item5440d18ae2:g:vB8AAOxyaTxRSEOD

or David Silver for 319 part

https://www.davidsilverspares.co.uk/parts/by-part-number/partnumber_90601319000/

Mr_Sheene:
Thanks a lot, the information is very useful. You're a better detective than me, I couldn't find the cir-clips on the DSS site. One little downside, what's the bit about thicker seals? Is that K2 onward after they changed the stanchions? DSS offers fork seals but with their history you have to know what you're asking for. I do need other stuff from Yamiya, so I may get them from there.

AshimotoK0:
I just fitted the ones Yamiya sell for the K0  and didn't use the back up ring.

There's a 13mm thickness seal used on later bikes and a Service Bulletin on it. seem to think I used an 11 mm though (Trigger?) and not so sure early sandcast used a 9mm thick seal plus back up ring.

BTW you should download this Service Bulletin collection which  I did in one  combined .pdf document if you are working on a 750. (most of originals came from BryanJ.)

https://www.dropbox.com/s/xkkwyl5lteti976/CB750%20Service%20Bulletins.pdf?dl=0

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