Yamaha 2010 YZF-R6 Manual Instruction page 53

Performance and purpose of kit suspension (Differences compared with standard suspension on commercially available machines)
Spring characteristics
Commercially Purpose
available machine
specs
Performance/characteristics
Problem with circuit
Kit suspension specs Linear spring characteristic can use up the entire range of the stroke while exerting the hold
of the initial braking period.
*Spring load: Depends on the stroke.
To increase comfort when riding in urban areas while
preventing bottoming when suddenly riding over a gap while
banking on a bend.
At the lowest possible spring setting, the air spring effect is
increased depending on the oil level.
An oil lock mechanism is fitted for the purpose of preventing
bottoming (metal contact).
Instability caused by excessive front dip movement during the
initial braking period.
Stroke cannot be used up. (Stroke stops sharply in the second
half of braking.)
Kit
1G
Commercially
available machine
Stroke (mm)