New brakes time

[Pat Conlon]

Do you have the correct seals for your model of caliper?

The Yamaha axial mount monoblock calipers comes in two flavors
1) the 2001 and earlier silver or blue button calipers use the thinner wall stainless steel pistons.. the seals on these calipers are crazy expensive (and I don't know why) see here:
https://www.partzilla.com/catalog/yamaha/motorcycle/2001/yzfr1-yzfr1n/front-brake-caliper

2) the 2002/2003 gold button calipers (last years of the axial mount caliper on the R-1) uses the thicker wall aluminum pistons...these seals are a different part # than the above seals and are much less expensive.
https://www.partzilla.com/catalog/yamaha/motorcycle/2003/r1-yzfr1r/front-brake-caliper

I'm not sure you can use the less expensive aluminum piston seals on the stainless steel piston calipers, the part #25803 is the same, but model prefix is different and on the 'Related Fitment' listings I see no backward compatibility with the 02/03 seals and bikes using the earlier calipers.

Aluminum pistons use inexpensive seals:


Stainless pistons use $$$ seals



Cheers.  Pat

[Waiex191]

Pat,
I've got stainless pistons and bought the kit from RPM. They seemed right.

I've just got the MC back together. I may have done a poor job on installing the new seals. I also re-cleaned everything and polished the piston where the seal rides. Also the inboard seal was not stuck on the spring properly the first go. I think it's better. We will see shortly.

[Millietant]

Not sure why it is Pat, but the seals for my stainless early blue spots R1 calipers are not particularly expensive compared to seals for most other bikes. Not had any issues with my R1 calipers over site a few years.

I wonder if it's just an availability issue in the USA that is driving the price up?

[Pat Conlon]

I hear ya Dean, the price is one thing, but different part # prefixes and according to the 'related fitment' listings, it shows only forward compatibility for the 2002/2003 seals and no backward compatibility for the earlier calipers. Same with the 2001 and earlier seals, No forward compatibility with the 2002+ calipers.

I wonder what's up? I think I'll go visit the R-1 forum and ask the question.

Bryan, what Yamaha part # did you get?

Cheers

[Waiex191]

Bryan, what Yamaha part # did you get?

Cheers

390N?  That's on the casting.

[Pat Conlon]

Bryan, what Yamaha part # did you get?

Cheers

390N?  That's on the casting.

The part # on the seals

[Waiex191]

The part # on the seals

These ones:
http://rpmracingca.com/proddetail.asp?prod=BlueSpotCaliperORings

[Pat Conlon]

The part # on the seals

These ones:
http://rpmracingca.com/proddetail.asp?prod=BlueSpotCaliperORings

Ok, no problem,  I was just wondering if they had a Yamaha part # on the bag vs aftermarket.

[Waiex191]

Ok, no problem,  I was just wondering if they had a Yamaha part # on the bag vs aftermarket.

From memory, the parts were in an unmarked bag.  The RPM folks probably know what they are.

I think I have my leaks squared away.  Bike is packed up for tomorrow's commute after a short test ride tonight.

Still working fender fixes, I'll share that later.