Since BD9 offers a million different flex combinations in the motormount area I'll try and give you some ideas on what's what.

Please note that these are my personal findings and that results might differ from what you experience in your specific racing environment.

# Special notes for motor mount flex:
- use the long motor link plate
- use hole 3 or 4 from the back
- connect the right hand layshaft mount via a grub screw, or a button head screw
- mount the battery post with an oring or a soft shim so that you don't have to use a countersunk screw all the way in the front

# setup influence of motor mount screw position:
- further back = more mid corner bite, more responsive in fast corners, may cause snap oversteer, less precise initial
- further forward = less mid corner bite, less steering in fast corners, easier to drive, more forward drive, good for high grip

# motor mount assembly setup:
(the button head screw on the motormount is always to be used!)
grub screw in the right layshaft mount = more natural flex feeling, more responsive high speed steering, less low speed rotation, more locked in feeling

button head screw in the right layshaft mount = more numb steering feel, less high speed steering, more low speed rotation, better forward drive, good for high grip, more floating feel

Note the battery post position and the plastic washer at the bottom!
Also, floating centre weight