Fork sizes and swaps

I was looking at a listing of fork sizes and it said that 550 Maxim and Seca had different size forks. I know the lowers are different, but is there really a diameter difference in the inner tubes? The list said Maxim was 36mm and Seca was 35mm.

I am kind of musing about swapping out the stock Seca fork for something with dual disks. Even though it's a pretty light bike, it kinda feels like it could use more brakes at times.

Maybe I could fit 650 Seca forks? Anyone know what their dimensions are?

 

Try this:

http://katriders.com/wiki/index.php5?title=Fork_Specs

 

you'd be farther ahead to change the whole front end

 

That list says FJ600 has the same fork tubes. That might be a nice option. I can measure the one I have and see if it's true.

Triple trees and all, you mean?

 

Does the US 550 front wheel have the blanking rubber for a second disc ? If so you could try and source a Euro fork slider
with the caliper lugs on - should be cheap and light enough to send at not too much cost. All EU 550s had twin discs..

 

Yes, the wheel does have the delete plate.

However, I found that EU-spec fork lowers are different on both sides and don't cross over to any other bike. The right lower is not the same s US-spec right lower. The US caliper is also not the same as the EU right caliper.

 

Ah. My bad. I guess teh US disc may be bigger diameter to compensate in that case..

It does beg the question though ' Why the hell did they do that ?'

Good luck with your quest.

 

Yeah, been scratching my head over that one.

 

Incidentally, here are the part numbers I found in my research. All of them show as unavailable in the catalogs, so this is strictly informational.

Euro spec:

Tube,outer 1 clear buffing
4G0-23126-00-38

Tube,outer 2 clear buffing
4G0-23136-00-38

Caliper assy
4L3-25810-30-00

Caliper assy
4L3-25810-20-00



US spec:

Tube, Outer 1 CLEAR BUFFING
4U8-23126-00-38

Tube, Outer 2 CLEAR BUFFING
4U8-23136-00-38

Caliper Assembly Right
23W-25810-02-00

 

Hi

Are you assuming they're different due to different part nos or have you had a chance for a side by side comparison? Could
just be Yamaha playing silly buggers with part numbers-it's bee known before i think.

I have euro brake parts and forks I can measure if it helps..

James

 

Calipers and tubes look different in the parts drawings.

Of course, that could be inaccurate, too.