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KYB SSS

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I happened to own a YZ250 and an RMZ250 (2012) until I sold the YZ a couple of days ago. I swapped the master cylinder from the YZ to the RMZ which is far superior to the RMZ master cylinder. 

I also wondered about getting the YZ front end onto the RMZ. Not an easy or likely proposition. The head stem lengths greatly differ (an inch or so from memory), so a full triple clamp swap is already out of the question. Using a digital caliper I determined the outer fork tubes on the RMZ are a full mm or so less diameter than the YZ tubes - indicating 3+mm difference in circumference, which means there's no way the YZ outer tubes will be safely going into the RMZ triple clamp and vise versa. 
As such unless a specialised set of triple clamps were manufactured I think we're out of luck. I personally don't mind my 2012 suspension, though the SSS is slightly better. I'll never touch a set of Air Forks. 

 

I do have a buddy who put his YZ front end on his KTM - man those KTM have shit suspension (I had a 2012 KTM 250SX- wristbreaker). Both being 48mm I don't think there was a problem. 
Cheers
Brendan

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I mean why not revalve possibly respring your existing forks?

Sss are cool. You can put ant front end on any bike. Just gotta make a new stem. I you cant machine go to a machinist. Youll bolt on. Make an rmz stem for the sss lower triple. Itll press right in the triple and bolt right onto the frame. Rmz bearings. I just put an 06 r1 front end onto an 06 vfr800 frame. Bolt on. Vfr bearings and stem hardware.

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20150626_184130.jpg

20150629_200653.jpg

The stem was machined; same as the r1 at the base to press into the r1 lower triple, lower bearing area OD the vfr lower bearing ID, top bearing area OD the vfr top bearing ID. Then vfr stem thread set up top.

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Given the rather different head stem lengths, the YZ fork outer tubes are also significantly longer. So your RMZ will either be riding high like a grasshopper / chopper, or your tubes will stick out the top and foul on your handlebars. Or you'll need to space out your headstem. Or use bar risers. However you try to solve it will stuff up your geometries.

I do recommend the late model YZ master cylinder over ours though! :-D

Edited by brenno
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I mean why not revalve possibly respring your existing forks?

Sss are cool. You can put ant front end on any bike. Just gotta make a new stem. I you cant machine go to a machinist. Youll bolt on. Make an rmz stem for the sss lower triple. Itll press right in the triple and bolt right onto the frame. Rmz bearings. I just put an 06 r1 front end onto an 06 vfr800 frame. Bolt on. Vfr bearings and stem hardware.

I've been through a couple Z250s, both with the SFF and standard forks and i still cant find a setting thats as good as the SSS stuff. Was just wondering if there was a shot in the dark of getting kybs up front. 

Edited by AJMAG247

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Given the rather different head stem lengths, the YZ fork outer tubes are also significantly longer. So your RMZ will either be riding high like a grasshopper / chopper, or your tubes will stick out the top and foul on your handlebars. Or you'll need to space out your headstem. Or use bar risers. However you try to solve it will stuff up your geometries.

I do recommend the late model YZ master cylinder over ours though! :-D

Ah see i prefer the suzuki MC over the YZ. i did think about putting a honda MC up front and a SS brake line to get a better feel

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We've ran sss forks on a fxf and and rmz with great results.  We took up the tolerance with circumference shims that go the full depth of the clamp holes utilizing a top hat lip to locate and a 3mm wide slit down the length of them so than can "pinch" with the clamps


different fork lugs will have to be used also

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