The rear brake isn't releasing properly on my NSR250. Since I've had this experience before on my older Hondas on the front, I figure it's simply the O ring (or O rings) that go around the piston. On the online parts page, it appears there are 2 o-rings but they have different reference numbers, and also the description is incorrect for both of those numbers. It looks like #14, "seal piston" (part number 43209-371-006) would be the correct item. but alas under 8N it doesn't even show a 1 let alone 2 as in the photo.

Whew....

Basically, do I have the correct part number for my NSR250R8N and do I need one or two? And where do I get them, local Honda shop or somewhere online? A search shows that part number coming up as a seal for all kinds of other bikes and my luck isn't normally that good. Any other advice before I get wrist deep in this rear caliper rebuild?

Thanks,
Craig

I'd have to imagine that the whole caliper crosses with some other -bigger-US avalible bike. Like a CBR of some year....Heck, my bike has CBR929 front calipers on it, and man do they grab much different than my neighbors 929 does! Must have something to do with the NSR's weight?
I'd start by looking at what bikes NSR rear pads work on, and go from there. Someone probably knows something about it already though... I may even have one in my spare parts... But I'd have to dig to see...

Steve
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MC21
04 NSR50R
93 CBR F2
98 CBR F3 track bike
95 VFR750
89 FL400R Pilot
90 FZR 4/600

I serviced my calliper and the seals did'nt need to be replaced , be gentle with them and you can remove them without damaging them .

Definitely service it first.

Unbolt the caliper, remove the pads and place a piece of wood between the pistons wide enough to prevent them coming out of the caliper, then gently press on the pedal until both pistons are protruding.

Give them a squirt with something like WD40 or proper brake cleaner, and a scrub with a toothbrush.

To get them back in the caliper, twist the piece of wood as far as it goes, then either use a G clamp, or some other ingeneous method using a pair of spanners. Be careful not to force them - if they don't slip in easily then you have probably twisted them.
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MC21SP Plaything
BMW F800GS Bumblebee
Triumph 9551 Daytona Big boys toy
FJ1100 Sporting relic
GTS1000 oddball

Fixed. The bike must have been sitting for some time, as the brake didn't want to function much at all. I had to move it with the pedal about 1/16", then push the piston back in. I must have done that about 20 times and it finally went out more than one pump. Kept working it again and again and again and now it works like it should.

It sure is a little nicer to ride now that I can balance out the front brakes with the rear! The guy on the new GSX-R in town (man that pipe is UGLY) sure didn't know what to think of it.......!!

Craig

The descriptions is the parts manual tend to be correct, the numbers have been messed up.
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Please do not PM me technical questions, if you can't find it on the Forum start a thread

Has the same problem with my MC16. I took the caliper apart, removed the pistons and found a lot of muck under the seals. Took the seals out, cleaned the muck out, used some wet and dry on the the pistons to clean them up and then put the old seals back in and used syntheitc lubricant on the pistons before I pushed them back into the caliper.

Put it all back together, and after filling with new brake fluid the brakes are working like new.