Topic: SOHC Brake Calipers

[Retroben]

Hey everybody,

I have a question relative to my new bike (82 CB650SC) but more about that era Hondas in general, and I'm hoping one of the knowledgeable people on here might have something to share.

The bike I just bought needs a brake rebuild but the dust seal part#45109-460-841 and piston seal #45209-460-841 are showing as unique to this year and model bike - and every place on the web I've called that has them listed (bikebandit, cheapcycleparts.com and a couple others) say the dust seal is  backordered indef. from Honda.  No hits for the part # on ebay.  Meanwhile, the old ones were in bad shape, destroyed on removal (it was a mess in there), then swept up off the shop floor and thrown away by my trusted assistant Mr. Heineken.

I'm thinking, how could it be they made a caliper for one model  only?! So I'm wondering about how the brakes developed at Honda. When did dual pistons come out?  What diameter were they?  My bike's pistons are 27mm, but the next year the nighthawks went to 32mm pistons (along with the complete DOHC redesign).  So maybe these calipers were common to 82 and earlier SOHC Hondas?  If the calipers aren't identical, wouldn't the seals at least be the same if the pistons were the same diameter? 

Is there a parts fiche anywhere that would give me the exact dimensions of those seals?  And is there a "history of Honda motorcycle brakes" anywhere that would shed light on when the major redesigns happened?

Found the parts from one supplier in the UK, but I'd really like to get rolling ASAP and don't feel like waiting for int'l shipment.

[bryanj]

There is no literature to tell you what you want and Honda were a big enough manufacturer to buy a caliper that would only fit one model from the suppliers, it may have been planed to use it in future but plans/sales characteristics change. If you can find another with the same size the seals may fit but then Honda woould list them under the same number, Habe you tried putting the numbers into the quick parts lookup at Motogrid to see if they were used elswhere?

[Retroben]

All the sites with fiches or parts finders all list both my part #s, dust seal and piston seal, as being one-year, one model (82 CB650SC)  parts.  Amazing.

[trueblue]

I'm pretty certain that the seals off of a cx500 fit, I have complete cx500 calipers on my 650z, but from memory the pistons and seals are all the same but use different part numbers

[Retroben]

@trueblue, do you know the diameter of those CX500 caliper pistons?  27mm, by any chance?

[trueblue]

@trueblue, do you know the diameter of those CX500 caliper pistons?  27mm, by any chance?

No sorry, they are 38mm, single piston calipers, but I was going to convert it to twin piston calipers which were 27mm pistons, I can't remember what they were from and the kits were still available for them. If you have no luck try Ross at Tiaro Motorcycle Wreckers, http://www.tiaromotorcyclewreckers.com/index.htm I recomend him highly, if it weren't for his expertise and sheer knowledge my 650 would still be a wreck waiting to be reborn. He ships to anywhere, and tell him Andrew with the 650 honda sent you his way.