I've had the '76 (Miss June '20) up on milk crates for awhile, initially to fix a left-hand case leak.
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Seemed to be either the primary sprocket seal or shifter seal, so I replaced both.
Bob's nice photo-heavy thread was helpful
http://www.xs650.com/threads/replacing-engine-seals-part-one-the-shifter-seal.52589/
Upon inspection, there was a little bit of uneven drag in front brakes when I spun the wheel.
I had rebuilt the master back in 2013 when I restored this bike,
so I decided to rebuild the caliper, even tho the pistons were moving well.
There was just a bit of corrosion in the bores, and the pistons cleaned up nice with just a rag.
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Installed new seals.
The brake disk surface wasn't great, with pitting from neglect from the PO; he left the bike outdoors.
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So, I sent it off to TrueDisk in Michigan, as I was unable to find someone local to grind a new surface.
His website is rather impressive.
https://truedisk.net/
On the phone, Tom was friendly and easy to talk to.
He said he would true the disc first using a mallet.
Turns out mine didn't need truing.
He works at home, having a day job.
Promised me a day or 2 turn-around, but that didn't happen.
He got it on a saturday, and hadn't even looked at his packages yet when I called on wednesday.
Did the work on thursday, billed me on Friday, and shipped it that day.
Looks good:
View attachment 177541
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The disc was 7.02mm prior to cutting, and 6.86mm after, so he took off .16mm.
View attachment 177543
Cost:
Shipping to him $15 flat rate USPS medium box
grinding: $ 45
surprize surcharge $10 for "handling, insurance (no documentation of this provided), Paypal fee"
return shipping $15
So, it was $85 total. Nice work, but I think I'll look harder for a local shop to do this next time.
Gonna put it back together tomorrow........
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