First, I'm no expert, never claim to be...I've got about a 1/16 of an inch left on the rear tire that hasn't been worn.
If you have more tire left, the bike will take the lean angle fine, as long as it is balanced.
Standard stuff -
- do any braking BEFORE the turn. By the time you are beginning to lean you should be on the gas. Even if it is slight, you should be on the throttle. This balances the bike front to back (there are more advanced things like trail braking but I'm not that good)
- Another part of that is it is always better to go in too slow, and accelerate out, so only do what you are comfortable with.
- Your lower arms should be PARALLEL to the ground, with your shoulder and elbow soft. The busa takes very little muscle to turn. Relax all the muscles in your arms as if they are just hanging from your shoulder. Lean (forward) to whatever angle to acheive the parallel between lower arms and ground.
The bike shouldn't feel like it is diving. If it does, you don't have enough throttle. It shouldn't ever feel like it is away from your body, your body should be with it.
Something I learned that I really like to do (my Katana LOVED this), is just before I start turning, I lean (my upper body) a little to the inside, then push the bike underneath me. Kind of leading the bike into the turn. My Katana required this because it required a little more umph to turn fast. The busa doesn't but still responds well.
BUT, if you start leaning your body off to the inside, you will not use as much tire. You will be going faster for the same amount of bike lean angle.
Wow, sorry for writing the book...I looooove the twisties.