19-07-12, 04:54 PM
If them plain shank bolts are the same ones as fitted to the R1 / R6, they're what's called "shouldered" screws, as far as I can see the shoulder is primarily for locating the disc (so the disc can't run out of "true" beyond a given tolerance in relation to the wheel) rather than any difference in shear strength values.
As for removing the bolts, a little heat (you don't need to go mad with it) will help; disc bolts tend to be Loctited (for good reason) - the heat will help soften it up.
R6 disc change Performance Upgrades Yamaha YZF-R6 Front Brake Rotor Install about 2 minutes in, and you'll see the "shoulder" quite clearly.
As for removing the bolts, a little heat (you don't need to go mad with it) will help; disc bolts tend to be Loctited (for good reason) - the heat will help soften it up.
R6 disc change Performance Upgrades Yamaha YZF-R6 Front Brake Rotor Install about 2 minutes in, and you'll see the "shoulder" quite clearly.