2001 YAMAHA YZ125LC engine

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Page 518 of 558

YAMAHA YZ125LC 2001  Manuale duso (in Italian) 7-10
TUNSETTING
EC71C020
Road condition and examples of carburetor setting
EC71D040
Examples of carburetor setting depending on symptom
Symptom Setting Checking
At full throttle Increase main jet cali

Page 519 of 558

YAMAHA YZ125LC 2001  Manuale duso (in Italian) 7-11
TUNSETTING
Symptom Setting Checking
0~1/4 throttle Use jet needle having a smaller  Number of turns-back Õ
* Hard breathing diameter. Correct properly
Speed down Overflow from carburetor
0~1/4 t

Page 526 of 558

YAMAHA YZ125LC 2001  Manuale duso (in Italian) 7-12
TUNSETTING
EC71M001
Change of the heat range of spark plugs
Judging from the discoloration of spark plugs, if
they are found improper, it can be corrected by
the following two methods; changing c

Page 528 of 558

YAMAHA YZ125LC 2001  Manuale duso (in Italian) 7-13
TUNSETTING
EC720000
CHASSISEC71P002
Selection of the secondary reduction ratio 
(Sprocket)
Secondary Number of driven sprocket teethreduction =——————————————
ratioNumb

Page 540 of 558

YAMAHA YZ125LC 2001  Manuale duso (in Italian) 7-19
TUNSETTING
EC72B000
Rear suspension setting
The rear suspension setting should be made
depending on the rider’s feeling of an actual run
and the circuit conditions.
The rear suspension setting
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