Yamaha TZ250M1 Owner's Service Manual page 282

Driven sprocket
Drive sprocket
14T
15T
16T
35T 36T
2.500 2.571
2.333 2.400
2.188 2.250
7-18
SETTING
EC71P011
Selection of the secondary reduction ratio
(Sprocket)
Secondary
Number of driven sprocket teeth
w
reduction =
Number of drive sprocket teeth
ratio
Factory-set secondary
reduction ratio
37T 38T
2.643 2.714
2.467 2.534
2.313 2.375
The larger value, the higher speed ratio
The smaller value, the lower speed ratio
EC72N000
Drive and driven sprockets setting parts
Part name Size
Drive sprocket 1 1
* 14T
15T
16T
Driven sprocket 2 2
35T
* 36T
37T
38T
39T
40T
* Factory installed
TUN
36/14 (2.571)
39T 40T
2.786 2.857
2.600 2.666
2.438 2.500
Part number
93834-14178
93834-15079
93834-16104
4TW-25435-02
4TW-25436-02
4TW-25437-02
4TW-25438-02
4TW-25439-02
4TW-25440-02