Effect Of Setting Parts In Relation To Throttle Valve Opening; Main Jet Adjustment - Yamaha YZ125N1 Service Manual

SETTING
EC714060
Effect of setting parts in relation to throttle
valve opening
Setting part
Full-closed 1/4
Pilot air screw
Pilot jet
Diameter of
straight portion
Clip position
Throttle valve
Main jet
1 Throttle valve opening
2 Full-open
3 Full-closed
EC715002

Main jet adjustment

The richness of air-fuel mixture with 1/2~4/4
throttle can be set by changing the main jet 1.
Standard main jet
*For EUROPE
1. Spark plug is too hot.
Select a main jet having higher calibrating
No. than standard. (To be enriched)
2. Spark plug is wet.
Select a main jet having lower calibrating No.
than standard. (To be leaned out)
7-3
TUN
Throttle valve opening
1/2 3/4 Full-open
#460
*#450