Yamaha YZF-R1 Service Manual page 24

(Setting of back torque limiter of clutch).
A clutch with a back torque limiter mechanism is installed in the YZF-R1 engines. The
operation of the back torque limiter can be adjusted through adjusting: 2 the number of SHIMs
(set up for the kit); the number of springs; the whole thickness of the clutch plate; and the
a b
strength of c spring (set up for the kit) of the slipper clutch setting set.
(Recommended setting method)
To begin with, the dimensions of the clutch are re-set to the standard values. (For details,
please refer to the service manual published from YAMAHA MOTOR CO. LTD.
If you attach the slipper clutch setting of kit , make it the same as the standard setting.
1 2
When decreasing the number of SHIMs (standard setting is three) of slipper clutch setting set,
the back torque limiter tends to be effective (Engine braking becomes less effective).
Standard
3 2 1 0
effective
(Engine braking becomes
less effective)
Further, when decreasing the number of a spring (the number of standard setting is three) to
two, the back torque limiter becomes effective (Engine braking becomes less effective).
The clutch spring c can be either the kit item or the standard item.
If you mount the clutch spring from the kit, the back torque limiter tends to be less effective (the
engine brake becomes stronger).
NOTICE
When decreasing the number of a spring to two, the caution should be taken to surely
use three pieces of SHIMs for the slipper clutch setting set. If its number being less than
the above, the less load may be supported so as to exert serious influences on driving.
Decreasing the number of a spring to one is not allowed.
– 20 –