Posted June 3, 200915 yr G'day guys, Want to give my XS 250 better brakes up the front, are 650 brakes compatible (in terms of mounting bolts etc) with 250/400 wheels? Or am I better off going for something else. Cheers
June 3, 200915 yr Moderator G'day guys, Want to give my XS 250 better brakes up the front, are 650 brakes compatible (in terms of mounting bolts etc) with 250/400 wheels? Or am I better off going for something else. Cheers if you have the mounting for a caliper on the left side, you can use SR500 caliper and caliper mount (it even says left on the mount) you can get disks either from ebay or maybe the sr (not sure!) you then need to make up some new hoses as they will have to go from the master cyl using a double banjo. you also need an XS1100/750/850 master cylinder to push more brake fluid. the wheel has a plastic cover on with drillings for the brake disk.
June 3, 200915 yr Author if you have the mounting for a caliper on the left side, you can use SR500 caliper and caliper mount (it even says left on the mount) you can get disks either from ebay or maybe the sr (not sure!) you then need to make up some new hoses as they will have to go from the master cyl using a double banjo. you also need an XS1100/750/850 master cylinder to push more brake fluid. the wheel has a plastic cover on with drillings for the brake disk. What's wrong with using the master cylinder from the 650? Was also planning on keeping the 250 disk, or is this a no-no?
June 3, 200915 yr Moderator What's wrong with using the master cylinder from the 650? Was also planning on keeping the 250 disk, or is this a no-no? if you have 2 disks for the front that's fine. thought you only had one (250) on the front! just helping you source another disk if the master cylinder from the 650 was for twin disks, it should be ok!
June 4, 200915 yr Author Ohh, right. So 650's have twin discs? Didn't know that. No, I was only going to have the one disk. So that's why I need to get a different master cylinder ey? Cheers
June 4, 200915 yr Moderator as i think the 650,s brake system was the same anyhow you will not find much improvement, first step would be too strip the caliper and give it a good clean make sure all the pivots etc are free, and the piston is not rusted/seized fit new seals as well if the piston is rusty and pitted stainless ones are available, When Chris Pearson did the 120 mph RD250E (that uses same system) for CMM he used the standard caliper but a modern master cylinder and said braking was much improved on it merv
June 4, 200915 yr Author Hmm, will keep that in mind. Thanks mate. Any ideas for a 'modern' master cylinder?
June 4, 200915 yr Moderator Hmm, will keep that in mind. Thanks mate. Any ideas for a 'modern' master cylinder? magura springs to mind. yep some 650's had twin disks!! you could always go FZR400 disk and a modern nissin caliper and then make up new mount!!!
June 5, 200915 yr magura springs to mind. yep some 650's had twin disks!! you could always go FZR400 disk and a modern nissin caliper and then make up new mount!!! who does this bike belong to? and why all the drilled out material?
June 5, 200915 yr Moderator why all the drilled out material? To save weight would be my 1st guess....
June 7, 200915 yr Moderator it was on sale in german ebay for racing purposes only. I saved the pictures for my info!! it was rebored to 450cc and BIG inlet valves fitted, charging system removed so igntion was via total loss battery. drewps
June 7, 200915 yr Ohh, right. So 650's have twin discs? Didn't know that. No, I was only going to have the one disk. So that's why I need to get a different master cylinder ey? Cheers Hi, Some XS650s have a single disk ~1979 XS650S & later XS650SE's... But both master cylinders (twin disk XS650 & single disk XS650's) will have enogh power to pull 2 disks with the correct hose .. If you use the std XS400 disk why bother changing the rest for no advantage ! Regards Jim
June 8, 200915 yr Will a 650 caliper and master cylinder work in direct conjunction on a stock 400 front end and rotor?
June 8, 200915 yr Author Will a 650 caliper and master cylinder work in direct conjunction on a stock 400 front end and rotor? That's what I want to know! ^
June 8, 200915 yr Will a 650 caliper and master cylinder work in direct conjunction on a stock 400 front end and rotor? Hi, That is what I stated the only other problem you may have is mounting the 650 caliper (I forgot that one) as you may find the bolt holes dont marry up Regards Jim
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