88 XR 600 rear brake conversion ?

Has anyone converted an 88 XR600 to disk brake in the rear ?

dont think it would be worth the $$$ but it would probly involve a new swing arm as the caliper stay would be diff from the drum not to mention mounting a resevoir, figuring out how to mount the new pedal. too much trouble i think

besides who uses their back brake anyways???

I would like to be able to make a panic stop on the street.

The rear drum in good shape can't brake the wheel loose on asphalt.

I was hoping somebody might know if a '91 or later wheel would be close.

I can fab the rest.

shoot, wish ya had posted this afew weeks ago when i had my 91 600, icouldve helped ya more...

Yes the wheel of the 91 is the same width as the drum brake wheel. The drum brake slid over a pin that stuck out from the inside of the swingarm. The 91 caliper mount slides into a grove on the inside of the swing arm.

I added a piece of aluminum to the bottom of the caliper mount, then cut a 15mm wide x 16.5mm deep keyway in the added piece. Caliper mount also needs to be machined at a 5 deg angle 40mm forward of axle center. This allows the caliper mount to slide onto the same pin as the drum did.

I could post pics of mine if you want.

I have a complete brake system I'll sell ya. Caliper, mount, pads, hose, master, resevoir and brake pedal.

If Honda handled the changeover from drum -> disk on the 600 the way they did on the 250 the only custom work should be welding on the master cyl bracket. The swingarm should bolt up.

Thanks for the offer on the brake parts but I got everything at the cycle salvage and am done with the fab stuff. What I really need is an XL hub since it has the little rubber cushions. Without these, the countershaft spline will eventually get trashed from the street riding. I just had to tear my motor down to change it.

it can be done. one local guy converted his old 84 XR350 to a disk rear.

Yes the wheel of the 91 is the same width as the drum brake wheel. The drum brake slid over a pin that stuck out from the inside of the swingarm. The 91 caliper mount slides into a grove on the inside of the swing arm.

I added a piece of aluminum to the bottom of the caliper mount, then cut a 15mm wide x 16.5mm deep keyway in the added piece. Caliper mount also needs to be machined at a 5 deg angle 40mm forward of axle center. This allows the caliper mount to slide onto the same pin as the drum did.

I could post pics of mine if you want.

Dragging out an old post here. Could you please post a pic of the modified caliper bracket? I am debating if its worth spending the $$ on a late model swingarm. I am also questioning my ability to weld a milled piece to the cast aluminum. Or, was it not necessary to weld a new piece on? I have yet to acquire a bracket... I was thinking about modifying one from a CBR since I'm using and F3 rear wheel for my motard project. Thank you.

What I really need is an XL hub since it has the little rubber cushions. Without these, the countershaft spline will eventually get trashed from the street riding. I just had to tear my motor down to change it.

The XL hub is wider than an XR and will not fit in the XR swingarm. (I tried to change the rear suspension on my XL over to all XR parts.)

I have an extra XL600 hub I would trade for an XR600 hub (both are drum brake setups).

I did this on my 89 XR600. You can take a look at this pictures here:

http://community.webshots.com/user/terrynshed

I ended up using a 1993 XR600 parts bike. Used everything from the swingarm back. Cut off the brackets from the 93 frame and welded them on my 89.

I was in the same situation. I wanted a rear disc for good stopping power and control on the street.

I did this on my 89 XR600. You can take a look at this pictures here:

http://community.webshots.com/user/terrynshed

I ended up using a 1993 XR600 parts bike. Used everything from the swingarm back. Cut off the brackets from the 93 frame and welded them on my 89.

I was in the same situation. I wanted a rear disc for good stopping power and control on the street.

 

 

Bringing back a super old thread. was wondering if you could post pictures of the conversion? your link isnt working

 

I have a 1997 xr6r, and bought a 1985 grandfathered, plated bike. swapping everything ever and registering as an 85 and just need to do this conversion for my back brake.

I added a piece of aluminum to the bottom of the caliper mount, then cut a 15mm wide x 16.5mm deep keyway in the added piece. Caliper mount also needs to be machined at a 5 deg angle 40mm forward of axle center. This allows the caliper mount to slide onto the same pin as the drum did.

I could post pics of mine if you want.

Cheaper and easier to replace the swingarm with a 90s 600R or 650L arm. They can be pretty cheap on ebay Edited by valvesrule

Cheaper and easier to replace the swingarm with a 90s 600R or 650L arm. They can be pretty cheap on ebay or I have an extra if interested.

 

 

Yeah this is my plan. I have an 85 plated frame and going to transfer everything from my 97 over (its otherwise impossible to get a plated XR in Oregon).

 

Really just wanting to see how people fab-ed up the brake reservoir and the brake pedal

Edited by mcswny

If you follow the letter of the law California is the same. Somehow KTM gets away with not passing many of the vehicle code requirements to sell new bikes. I recently scrapped a DR250S and scavenged the brake caliper mount for the future possibility of a disc conversion. Calipers and cylinders are pretty much the same on all the Japanese brands just the axle mounts and rotors are different.

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