Yamaha CRYPTON T105E/SE Owner's Manual page 72

Spark plug:
Type/manufacturer
Gap
Clutch type:
Transmission:
Primary reduction system
Primary reduction ratio
Secondary reduction system
Secondary reduction ratio
Transmission type
Operation
Gear ratio:
1st
2nd
3rd
4th
Model
T105E/T105SE
C7HSA/NGK, U22FS-U/DENSO
0.6~0.7 mm
Wet, centrifugal automatic
Spur gear
67/18 (3.722)
Chain drive
37/15 (2.467)
Constant mesh 4 speed
Left foot operation
38/12 (3.167)
33/17 (1.941)
29/21 (1.381)
23/21 (1.095)
71