APRILIA TUONO R FACTORY 2007 Service Station Manual page 136

Engine
Min. wear limit (4) 46.3 mm (1.823 in).
Partial replacement (worn discs only) is not allowed.
CAUTION
IF ONE OR MORE (STEEL OR FRICTION) CLUTCH DISC IS WORN, THE ENTIRE CLUTCH DISC
ASSEMBLY (COMPRISING TEN STEEL DISCS AND NINE FRICTION DISCS) MUST BE RE-
PLACED.
REPLACING THE ENTIRE FRICTION DISC UNIT INVOLVES CHANGING THE CLUTCH SPRING
UNIT. ASSEMBLING A NEW CLUTCH DISC ASSEMBLY WITH A USED SPRING UNIT IS NOT
ALLOWED.
Checking the pusher plate
Check the smoothness and the clearance of the
ball bearing (1) of the spring holder plate (2) and
replace them if required.
CAUTION
TO REFIT AND FIT THE BALL BEARING WARM THE
SPRING HOLDER PLATE TO 80 - 100 °C (176 - 212 °F). USE
A SUITABLE ASSEMBLY PUNCH.
Check that the compression surface (3) of the
spring holder plate (2) is not worn or uneven.
Max. allowed distortion (3) 0.10 mm (0.004 in).
Check the spring holder plate depth (4).
Max. wear limit (4) 33.5 mm (1.319 in).
Check the eccentricity of the disengaging shaft (5)
and also the presence of rolling marks on the slid-
ing surface of the oil seal.
Checking the clutch hub
Check the external toothing of the clutch hub (1)
to see if it is not dented (2).
Check the coupling surfaces with the discs, and
that the marks left by the grooves are not deeper
than the max. 0.3 mm (0.012 in) (2-3).
ENG - 136
TUONO R_FACTORY