1980 gs1100l right rotor fittment

[RDS]

Hello all,
I am restoring this bike that should have been a parts bike, however I was greedy for a deep dive project. Boy I got that! I’m looking for help sorting out this problem I have encountered. After rebuilding the forks and calipers, when I went to install the caliper brackets, the right side rotor is too close to the fork, the rotor will turn but is lightly rubbing. I’ve checked everything I can. I’m not sure if it was like this before I took it apart. I can feel the difference by placing my hand between the rim and rotor. A larger gap on the right side. I’m beginning to think the left and right rotors are different, and perhaps I have 2 left rotors.
Any thoughts as to what may be going on would be greatly appreciated.
Thank you all,
Richard

[Rich82GS750TZ]

Looking at the parts fiche, the right and left rotors are different part numbers.
https://www.partshark.com/oemparts/a...fb/front-wheel

[rphillips]

I'm thinking the different part #'s is due to the pattern of the slotted holes, if used same part, one side slots would point forward while other side slots would point backwards. I don't know but would expect the offset and mounting of both should be the same... Am thinking I remember an "L" and "R" stamped on them.

[rphillips]

I just read a post in a thread, Hello from the Netherlands, when front rotors are put on wrong side how noticeably different they "look", nothing mentioned about not fitting properly.

[RDS]

I now see the difference left to right. It does appear to be the drilled slot pattern, which only confirms to me that I have the proper rotors. 1 left/ 1 right. So now my mystery continues. I think I’ll swap them as a test to see if my clearance issues change sides. I’m flying sort of blind because I don’t know if I’m starting with the proper parts. I will let you know my findings tomorrow, and I want to thank everyone for the help.

[Grimly]

I now see the difference left to right. It does appear to be the drilled slot pattern, which only confirms to me that I have the proper rotors. 1 left/ 1 right. So now my mystery continues. I think I’ll swap them as a test to see if my clearance issues change sides. I’m flying sort of blind because I don’t know if I’m starting with the proper parts. I will let you know my findings tomorrow, and I want to thank everyone for the help.

I had this issue recently, when I re-assembled the forks/ wheel. I can't recall exactly what it was, but re-assembling it again, and paying careful attention sorted it out. Might have been one of the lower axle collars was in the wrong way around. Haven't a clue why, as I've had the front ends apart a lot more than once over the years.

[RDS]

Thanks Dave.
I’m glad I’m not alone on this, and good to know that a simple resolve may be around the corner. I’m hoping that going back to this another day with a new perspective may be what’s needed. again.
This forum has been a great help and appreciate all the experience and wisdom here!

[RDS]

OK….after some more thought and grimacing it appears the previous owner must have set the bearing too deep on the right side. I used a large socket and hammer to tap on the left bearing driving the right side out a bit. When I refit the wheel everything fell into place. I will now replace the bearings and life should be good. Let me know if anyone has any thoughts on what I found. I’m not sure which side has the ledge where it should stop, if that makes any sense.

[Grimly]

OK….after some more thought and grimacing it appears the previous owner must have set the bearing too deep on the right side. I used a large socket and hammer to tap on the left bearing driving the right side out a bit. When I refit the wheel everything fell into place. I will now replace the bearings and life should be good. Let me know if anyone has any thoughts on what I found. I’m not sure which side has the ledge where it should stop, if that makes any sense.

Offhand, I don't recall, but when you remove them you'll see it anyway.

[RDS]

I’ll check the clymer shop book, even though it’s loaded with inconsistencies, almost comical
Thanks