Yamaha TZ125M1 Owner's Service Manual page 236

SETTING
That is:
• Higher temperature expands the air with its
resultant reduced density.
• Higher humidity reduces the amount of oxy-
gen in the air by so much of the water vapor
in the same air.
• Lower atmospheric pressure (at a high alti-
tude) reduces the density of the air.
EC714032
Effects of setting parts in relation to throttle
valve opening
NOTE:
The power jet closes at 12,150 rpm of the
engine, after which only the main jet domi-
nates.
1 Throttle valve opening
2 Full-open
3 Full-closed
EC71E011
Basic process of carburetor setting
Ex-factory setting is on the richer side, which
should basically have no problems with the
brake-in procedure.
Refer to "STARTING AND BREAK-IN" section
in the CHAPTER 1.
1. Adjustment of main jet
Use a main jet 1 with a smaller calibration
number if the engine does not develop
more than 12,000 rpm after a few laps of
the circuit when the water temperature
becomes stable [60°C (140°F) or more].
Example:#220 ≥ #215
7-2
TUN
7