we all know the button trick, to free up the carrier/rotor movement. If not, search the forum for "warped rotors", "rotor buttons" etc. You should find that info.
Prepping VFR, I decided to take the rotor maintenance one step further. First, I check front rotors for thickness and rotor warpage. My manual (VFR12) shows limits as follows: Min thickness - 3.5mm; warpage - 0.20mm
(this pic was taken end the end, wasn't documenting it at first)
Ok, everything checks out and within service limits. However, VFR rotors didn't look its best (IMO) after 10k miles. A lot of directional brake pad deposits, groves, grime etc. So ..........
I decided to try Flex-hone brush originally made for vehicle rotors (by Brush Research). Brush comes with 3 levels of abrasion. For moto rotors, I selected to go straight to the finest one, 240 grit.
How it works: Brush is inserted in the drill (preferably corded) and is being rotated with about 1k rpm. Brush needs to be slightly angled to the rotor surface, about 10'. At the same time, rotor needs to be rotated about 200rpm. I found that if one applies just the right amount of pressure, with a little hand push at the beginning, a friction between the rotor and the brush will make wheel/rotor rotate without any further assistance for a period of time.
Tip: hand push direction should be opposite to the drill's direction of rotation. Drill clockwise - wheel/rotor counterclockwise and vice versa.
For the final finish and somewhat even cross pattern, I did a few quick final passed in both direction.
the whole process in action (rotors are already reversed in these pics)
After both sides were done, the wheel came off, rotors got reversed and the wheel was mounted back to finish the job.
Pic of 6 pot VFR calipers for your entertainment.