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S1owner
Posted on Sunday, March 29, 2015 - 05:56 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ok this is for thise of you that think I will drill holes in my rotor because it looks cool or instead of buying one that has them.
This is a rotor that came on my XB wheel that the PO had drilled. It looked fine but I cleaned it and rubbed it out with Steel wool and you can see all the hailine cracks. Needless to say its junk





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Ft_bstrd
Posted on Sunday, March 29, 2015 - 05:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Wow!
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Brother_in_buells
Posted on Sunday, March 29, 2015 - 06:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Have seen this with hard used disks to!
Are You sure about the drilling
and what size are these holes?
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S1owner
Posted on Sunday, March 29, 2015 - 06:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Def done by someone other tgan the manufacturer. Inconsistant no pattern you can feel the raised edge
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Ratbuell
Posted on Sunday, March 29, 2015 - 09:45 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

My only question is...."WHY?"

Cross-drilling looks "cool" to some people but causes weaker rotors, as shown here.

SLOTTING allows braking gasses to escape.

But of course, you can't homebrew a slotted rotor...
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1313
Posted on Monday, March 30, 2015 - 06:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Inconsistant no pattern

The pattern matches an early XB (before being made compatible with the 1125's) rear rotor perfectly. It's an odd, somewhat irregular pattern, but it's there.

The cross-drilled holes do look to be slightly larger than OE, however.

If truly done 'after the fact' I'm somewhat impressed by how round the enlarged holes are...
1313
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S1owner
Posted on Monday, March 30, 2015 - 06:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I cant promise either but if the early ones were like this I not in the know on that but there are an odd few that are extremely close to the edge and some holes are not through at 90 degree to the sisk while others are.
Any way this is a bad rotor.
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S1owner
Posted on Monday, March 30, 2015 - 06:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Your are correct looking at pics online it appears it is factory drilled but still a bad rotor
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Court
Posted on Monday, March 30, 2015 - 07:42 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Wouldn't be the first time misdrilled holes were a problem.

In 1997 we shipped 17 bikes that had the shock attachment hole, on the rear swing arm, drilled WAY (about 3/16") too close to the edge of the material.

Fortunately ..... We found it and tracked down the units unshipped and unsold at dealers.
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Screamer
Posted on Monday, March 30, 2015 - 08:26 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Court,
I believe you're thinking of the early 1999 aluminum swingarm?
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Mighty_mouse
Posted on Monday, March 30, 2015 - 11:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I did it to my '77 CB750SS back when I was a kid but I didn't go overboard like that and I also chamfered the holes to relief the stress cracks. Never had an issue. Might have to see if I can dig up an old photo now.

MM
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