Checking the secondary shaft
Characteristic
Maximum wear limit for selector gear splines
5.3 mm (0.21 in)
Minimum wear limit of the pinion side secon-
dary shaft seat
29.97 mm (1.18 in)
Minimum wear limit of the clutch side primary
and secondary shaft seat
19.97 mm (0.79 in)
Checking the desmodromic drum
•
Check the gearbox drum for any signs of damage, scratches or wear, and change the des-
modromic unit if necessary.
•
Check the desmodromic segment for any signs of damage and wear, and replace it if nec-
essary.
•
Check the desmodromic drum bearing for any signs of damage or pitting, and change the
drum if necessary.
Characteristic
Maximum selector shaft eccentricity
0.2 mm (0.0079 in)
Checking the forks
The purpose of the springs at the end of the gearbox control rods is to reduce vibration and make it
easier to engage the gears.
Characteristic
Maximum endfloat of selector forks
0.05 mm (0.0020 in)
Minimum wear limit of selector fork guide pins
6.8 mm (0.27 in)
Maximum eccentricity of the two fork guide shafts
0.05 mm (0.0020 in)
NOTE
THE FOLLOWING PROCEDURE IS VALID FOR ALL THE GEARBOX FORKS.
•
Check for damage, deformation and/or signs of wear on the roller of the gear fork cam and
on the gear fork tooth.
•
Replace the gearbox fork if necessary.
RS 660 - Tuono 660 Engine
ENG - 139
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