Anyone run with just a FL rotor?

... when I bought my 650C in 1976, I never saw another 650 Yamaha in the time I owned it. There's far more 650 Yamahas around now in the UK than ever there was in the 70's.
I wonder how many can say that. My first XS650 was a TXA in 74 when I left school. The family were all Triumph and Norton riders. I also rarely saw another then, as now. There are no XS's within 200 miles of me. I think I saw more in a 2 week Netherlands holiday in 2010 than during the whole of my life.
 
I wonder how many can say that. My first XS650 was a TXA in 74 when I left school. The family were all Triumph and Norton riders. I also rarely saw another then, as now. There are no XS's within 200 miles of me. I think I saw more in a 2 week Netherlands holiday in 2010 than during the whole of my life.
You're absolutely right about the Netherlands, Yamaha 650 was a popular bike over there back then. I was surprised the first time I visited in 1980 just how many there were over there.

When I bought my new 650C back in 1976, I definitely wanted a traditional twin over a multi cylinder bike. The Norton Commando was out of production, BSA ceased a few years before. So it was either a Triumph Bonneville or the XS650. I needed the bike to be reliable get to work each day transport. That ruled out the Triumph. I never saw another one during my ownership.
 
On my '77 tracker project I had an issue with the wheel where a rotor bolt bottomed out and snapped off in the hub. We tried many different ways to remove it with no success. In the end, I bought a left side caliper and mount from an SR500 and just flitted the rotor to the left side. CAVEAT I have not ridden this project yet, but the brake works just fine pushing it around the shop.
 
Dont get it .. Maybe missing something.
I am not sure about why the re balancing is necessary
If the disc and wheel is balanced on the right side
Why would it be in Dynamic unbalance mounted at left side
Depending on fabrication accuracy in mounting point
But the disc itself is symmetric and made in a lathe.
Typically in screw mounting there is some edge that centers the item here the disc at mounting and the bolts have a bit play
Your moment of inertia of the whole wheel will be off. It is likely insignificant at wheel speeds, but at a past job it had to be taken into account when designing high speed electric motor shafts
 
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